List of computing and IT abbreviations

This is a list of computing and IT acronyms, initialisms and abbreviations.

• 0–9
• A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
• See also
• References
• External links

0–9

• 0-day—Zero-day vulnerability
• 1GL—first-generation programming language
• 1NF—first normal form
• 10B2—10BASE-2
• 10B5—10BASE-5
• 10B-F—10BASE-F
• 10B-FB—10BASE-FB
• 10B-FL—10BASE-FL
• 10B-FP—10BASE-FP
• 10B-T—10BASE-T
• 100B-FX—100BASE-FX
• 100B-TX—100BASE-TX
• 100BVG—100BASE-VG
• 286—Intel 80286 processor
• 2B1Q—2 binary 1 quaternary
• 2FA—Two-factor authentication
• 2GL—second-generation programming language
• 2NF—second normal form
• 3DES—Triple Data Encryption Standard
• 3GL—third-generation programming language
• 3GPP—3rd Generation Partnership Project – 3G comms
• 3GPP2—3rd Generation Partnership Project 2
• 3NF—third normal form
• 386—Intel 80386 processor
• 486—Intel 80486 processor
• 4B5BLF—4-bit 5-bit local fiber
• 4GL—fourth-generation programming language
• 4NF—fourth normal form
• 5GL—fifth-generation programming language
• 5NF—fifth normal form
• 6NF—sixth normal form
• 8B10BLF—8-bit 10-bit local fiber
• 802.11—wireless LAN
• 8D—Eight disciplines problem solving

A

• A11Y—Accessibility
• AAA—Authentication, authorization, and accounting
• AABB—Axis Aligned Bounding Box
• AAC—Advanced Audio Coding
• AAL—ATM Adaptation Layer
• AALC—ATM Adaptation Layer Connection
• AARP—AppleTalk Address Resolution Protocol
• ABAC—Attribute-Based Access Control
• ABCL—Actor-Based Concurrent Language
• ABI—Application Binary Interface
• ABM—Asynchronous Balanced Mode
• ABR—Area Border Router
• ABR—Auto Baud-Rate detection
• ABR—Available Bitrate
• ABR—Average Bitrate
• ABR—Adaptive Bitrate (Streaming)
• AC—Acoustic Coupler
• AC—Alternating Current
• AC—Authorization certificate
• ACD—Automatic Call Distributor
• ACE—Advanced Computing Environment
• ACID—Atomicity Consistency Isolation Durability
• ACK—ACKnowledgement
• ACK—Amsterdam Compiler Kit
• ACL—Access Control List
• ACL—Active Current Loop
• ACM—Association for Computing Machinery
• ACME—Automated Classification of Medical Entities
• ACP—Airline Control Program
• ACPI—Advanced Configuration and Power Interface
• ACR—Allowed Cell Rate
• ACR—Attenuation to Crosstalk Ratio
• AD—Active Directory
• AD—Administrative Domain
• ADC—Analog-to-Digital Converter
• ADC—Apple Display Connector
• ADB—Apple Desktop Bus
• ADCCP—Advanced Data Communications Control Procedures
• ADDS—Applied Digital Data Systems
• ADO—ActiveX Data Objects
• ADSL—Asymmetric Digital Subscriber Line
• ADT—Abstract Data Type
• AE—Adaptive Equalizer
• AE—Authenticated encryption
• AEAD—Authenticated encryption with associated data
• AES—Advanced Encryption Standard
• AF—Anisotropic Filtering
• AFIPS—American Federation of Information Processing Societies
• AFP—Apple Filing Protocol
• AGI—Artificial General Intelligence
• AGP—Accelerated Graphics Port
• AH—Active Hub
• AH—Authentication Header
• AHCI—Advanced Host Controller Interface
• AI—Artificial Intelligence
• AIS—Automated Indicator Sharing
• AIX—Advanced Interactive eXecutive
• Ajax—Asynchronous JavaScript and XML
• AL—Active Link
• AL—Access List
• ALAC—Apple Lossless Audio Codec
• ALE—Annualized loss expectancy
• ALGOL—Algorithmic Language
• ALSA—Advanced Linux Sound Architecture
• ALU—Arithmetic and Logical Unit
• AM—Access Method
• AM—Active Matrix
• AMOLED—Active-Matrix Organic Light-Emitting Diode
• AMQP—Advanced Message Queuing Protocol
• AM—Active Monitor
• AM—Allied Mastercomputer
• AM—Amplitude Modulation
• AMD—Advanced Micro Devices
• AMQP—Advanced Message Queuing Protocol
• AMR—Audio Modem Riser
• ANN—Artificial Neural Network
• ANSI—American National Standards Institute
• ANT—Another Neat Tool
• AoE—ATA over Ethernet
• AOP—Aspect-Oriented Programming
• AOT—Ahead-Of-Time
• AP—Access point
• APCI—Application-Layer Protocol Control Information
• APFS—Apple File System
• API—Application Programming Interface
• APIC—Advanced Programmable Interrupt Controller
• APIPA—Automatic Private IP Addressing
• APL—A Programming Language
• APR—Apache Portable Runtime
• APT—Advanced persistent threat
• ARC—Adaptive Replacement Cache
• ARC—Advanced RISC Computing
• ARIN—American Registry for Internet Numbers
• ARIS—Architecture of Integrated Information Systems
• ARM—Advanced RISC Machines
• ARO—Annualized rate of occurrence
• AROS—AROS Research Operating System
• ARP—Address Resolution Protocol
• ARPA—Address and Routing Parameter Area
• ARPA—Advanced Research Projects Agency
• ARPANET—Advanced Research Projects Agency Network
• ART—Android Runtime
• AS—Access Server
• ASCII—American Standard Code for Information Interchange
• ASG—Abstract Semantic Graph
• ASK—Amplitude-shift keying
• ASIC—Application-Specific Integrated Circuit
• ASIMO—Advanced Step in Innovative Mobility
• ASLR—Address Space Layout Randomization
• ASM—Algorithmic State Machine
• ASMP—Asymmetric Multiprocessing
• ASN.1—Abstract Syntax Notation 1
• ASP—Active Server Pages
• ASP—Application Service Provider
• ASR—Asynchronous Signal Routine
• AST—Abstract Syntax Tree
• AT—Advanced Technology
• AT—Access Time
• AT—Active Terminator
• ATA—Advanced Technology Attachment
• ATAG—Authoring Tool Accessibility Guidelines
• ATAPI—Advanced Technology Attachment Packet Interface
• ATM—Asynchronous Transfer Mode
• ATT&CK—Adversarial Tactics, Techniques, and Common Knowledge
• AUP—Acceptable use policy
• AuthIP—Authenticated Internet Protocol
• AuthN—Authentication
• AuthZ—Authorization
• AV—Antivirus software
• AVC—Advanced Video Coding
• AVI—Audio Video Interleaved
• AWK—Aho Weinberger Kernighan
• AWS—Amazon Web Services
• AWT—Abstract Window Toolkit

B

• B2B—Business-to-Business
• B2C—Business-to-Consumer
• B2E—Business-to-Employee
• BaaS—Backend as a service
• BaaS—Banking as a service
• BaaS—Blockchain as a service
• BAL—Basic Assembly Language
• BAM—Block Availability Map
• BAN—Body area network
• BAS—Building automation systems
• Bash—Bourne-again shell
• BASIC—Beginner's All-Purpose Symbolic Instruction Code
• BBP—Baseband ProcessorCo
• BBS—Bulletin Board System
• BC—Business Continuity
• BCC—Blind Carbon Copy
• BCD—Binary Coded Decimal
• BCD—Boot Configuration Data
• BCNF—Boyce–Codd normal form
• BCP—Business continuity planning
• BCP—Best Current Practice
• BCS—British Computer Society
• BE—Backend
• BEEP—Blocks Extensible Exchange Protocol
• BER—Basic Encoding Rules
• BER—Bit Error Rate
• BFD—Bidirectional Forwarding Detection
• BFD—Binary File Descriptor
• BFS—Breadth-First Search
• BFT—Byzantine Fault Tolerant
• BGP—Border Gateway Protocol
• BI—Business Intelligence
• BIA—Business impact analysis
• BiDi—Bi-Directional
• bin—binary
• BINAC—Binary Automatic Computer
• BIND—Berkeley Internet Name Domain
• BIOS—Basic Input Output System
• BJT—Bipolar Junction Transistor
• bit—binary digit
• BLISS—Bimodal Lattice Signature Scheme
• Blob—Binary large object
• Blog—Web Log
• BMP—Basic Multilingual Plane
• BNC—Baby Neill Constant
• BOINC—Berkeley Open Infrastructure for Network Computing
• BOM—Byte Order Mark
• BOOTP—Bootstrap Protocol
• BPA—Oracle Business Process Analysis (BPA) Suite
• BPDU—Bridge Protocol Data Units
• BPEL—Business Process Execution Language
• BPL—Broadband over Power Lines
• BPM—Business Process Management
• BPM—Business Process Modeling
• bps—bits per second
• BRM—Business Reference Model
• BRMS—Business Rule Management System
• BRR—Business Readiness Rating
• BRS—Broadband Radio Service
• BSA—Business Software Alliance
• BSB—Backside Bus
• BSD—Berkeley Software Distribution
• BSoD—Blue Screen of Death
• BSS—Block Started by Symbol
• BT—BitTorrent
• BT—Bluetooth
• B TAM—Basic Telecommunications Access Method
• BURS—Bottom-up rewrite system
• BW—Bandwidth
• BYOD—Bring Your Own Device
• Byte—By eight (group of 8 bits)

C

• CA—Certificate authority
• CA—Computer Associates International, Inc.
• CaaS—Content as a service
• CAD—Computer-aided design
• CAE—Computer-aided engineering
• CAID—Computer-aided industrial design
• CAI—Computer-aided instruction
• CAM—Computer-aided manufacturing
• CAN—Campus network
• CAP—Consistency availability partition tolerance (theorem)
• CAPA—Corrective and preventive actiont
• CAPI—Cryptographic Application Programming Interface
• CAPTCHA—Completely automated public Turing test to tell computers and humans apart
• CAQ—Computer-aided quality assurance
• CASB—Cloud access security broker
• CASE—Computer-aided software engineering
• CAT—Computer-aided translation
• CBC—Cipher block chaining
• CBC-MAC—Cipher block chaining message authentication code
• CBPRNG—Counter-based pseudo-random number generator
• CBRNG—Counter-based random number generator
• cc—C compiler
• CC—Carbon copy
• CC—Creative Commons
• CCM—Central control module
• CCMP—CCM mode Protocol
• CCTV—Closed-circuit television
• CCX—Cisco Compatible eXtensions
• CD—Compact Disc
• CDE—Common Desktop Environment
• CDMA—Code-division multiple access
• CDN—Content delivery network
• CDP—Cisco Discovery Protocol
• CDP—Continuous data protection
• CD-R—CD-Recordable
• CD-ROM—CD Read-Only Memory
• CD-RW—CD-Rewritable
• CDSA—Common Data Security Architecture
• CEI—Comparably efficient interconnection
• CER—Canonical Encoding Rules
• CERT—Computer emergency response team
• CES—Consumer Electronics Show
• CF—Compact Flash
• CFB—Cipher feedback
• CFD—Computational fluid dynamics
• CFF—Compact Font Format
• CFG—Context-free grammar
• CFG—Control-flow graph
• CG—Computer graphics
• CGA—Color graphics array
• CGI—Common Gateway Interface
• CGI—Computer-generated imagery
• CGT—Computational Graph Theory
• CHAP—Challenge-Handshake Authentication Protocol
• CHS—Cylinder–head–sector
• CIA—Confidentiality, Integrity, Availability ^[1]
• CICS—Customer Information Control System
• CIDR—Classless inter-domain routing
• CIFS—Common Internet Filesystem
• CIM—Common Information Model
• CIO—Chief information officer
• CIP—Critical infrastructure protection
• CIR—Committed information rate
• CIS—Center for Internet Security
• CIS—Centre for Internet and Society (India)
• CIS—Computer and information science
• CIS—Comodo Internet Security
• CIS—Contact image sensor
• CIS—Continuous ink system
• CISA—Cybersecurity and Infrastructure Security Agency
• CISC—Complex-instruction-set computer
• CISO—Chief information security officer
• CIT—Center for Information Technology
• CIT—Computer Information Technology
• CJK—Chinese, Japanese, and Korean
• CJKV—Chinese, Japanese, Korean, and Vietnamese
• CLI—Command line interface
• CLR—Common Language Runtime
• CM—Configuration management
• CM—Content management
• CMDB—Configuration management database
• CMM—Capability Maturity Model
• CMMI—Capability Maturity Model Integration
• CMOS—Complementary metal–oxide–semiconductor
• CMS—Content management system
• CN—Canonical Name
• CN—Common Name
• CNC—Computerized numerical control
• CNG—Cryptographic Next Generation
• CNR—Communications and Networking Riser
• COBOL—Common Business-Oriented Language
• COM—Component Object Model or communication
• ConfigMgr—Microsoft Configuration Manager
• COOP—Continuity of Operations
• COPE—Corporate-owned, personally enabled
• CORBA—Common Object Request Broker Architecture
• CORS—Cross-origin resource sharing
• COTS—Commercial off-the-shelf
• CPA—Cell processor architecture
• CPAN—Comprehensive Perl Archive Network
• CP/CMS—Control Program/Cambridge Monitor System
• CPF—Control Program Facility
• CP/M—Control Program/Monitor
• CPRI—Common Public Radio Interface
• CPS—Characters per second
• CPU—Central processing unit
• CQS—Command–query separation
• CQRS—Command Query Responsibility Segregation
• CR—Carriage return
• CRAN—Comprehensive R Archive Network
• CRC—Cyclic redundancy check
• CRL—Certificate revocation list
• CRLF—Carriage return line feed
• CRM—Customer Relationship Management
• CRS—Computer Reservations System
• CRT—Cathode-ray tube
• CRUD—Create, read, update and delete
• CS—Cable Select
• CS—Computer Science
• CSE—Computer science and engineering
• CSF—Cybersecurity Framework
• CSi—CompuServe
• CSI—Common System Interface
• CSM—Compatibility support module
• CSMA/CD—Carrier-sense multiple access with collision detection
• CSO—Chief security officer
• CSP—Cloud service provider
• CSP—Communicating sequential processes
• CSP—Cryptographic Service Provider
• CSPRNG—Cryptographically secure pseudorandom number generator
• CSR—Certificate signing request
• CSRF—Cross-site request forgery
• CSS—Cascading style sheets
• CSS—Content-scrambling system
• CSS—Closed-source software
• CSU—Channel service unit
• CSV—Comma-separated values
• CT—Computerized tomography
• cTAKES—clinical Text Analysis and Knowledge Extraction System
• CTAN—Comprehensive TeX Archive Network
• CTCP—Client-to-client protocol
• CTI—Computer telephony integration
• CTFE—Compile-time function execution
• CTL—Computation tree logic
• CTM—Close To Metal
• CTR—Counter mode
• CTS—Clear to send
• CTSS—Compatible Time-Sharing System
• CUA—Common User Access
• C-V2X—Cellular V2X
• CVC—Card Verifiable Certificate
• CVE—Common Vulnerabilities and Exposures
• CVS—Concurrent Versions System
• CVSS—Common Vulnerability Scoring System
• CX—Customer experience

D

• DAC—Digital-to-analog converter
• DAC—Discretionary access control
• DAL—Database Abstraction Layer
• DAO—Data Access Object
• DAO—Data Access Objects
• DAO—Disk-At-Once
• DAP—Directory Access Protocol
• DARPA—Defense Advanced Research Projects Agency
• DAS—Direct Attached Storage
• DAT—Digital Audio Tape
• DB—Database
• DSKT—DesktopDRM
• DBA—Database AdministratorDV
• DBCS—Double Byte Character Set
• DBMS—Database Management System
• DCC—Direct Client-to-Client
• DCCP—Datagram Congestion Control Protocol
• DCCA—Debian Common Core Alliance
• DCL—Data Control Language
• DCS—Distributed Control System
• DCMI—Dublin Core Metadata Initiative
• DCOM—Distributed Component Object Model
• DD—Double Density
• DDE—Dynamic Data Exchange
• DDL—Data Definition Language
• DDoS—Distributed Denial of Service
• DE—Desktop environment
• DDR—Double Data Rate
• DEC—Digital Equipment Corporation
• DEP—Data Execution Prevention
• DER—Distinguished Encoding Rules
• DES—Data Encryption Standard
• dev—development
• DFA—Deterministic Finite Automaton
• DFD—Data Flow Diagram
• DFS—Depth-First Search
• DFS—Distributed File System
• DGD—Dworkin's Game Driver
• DH—Diffie–Hellman
• DHCP—Dynamic Host Configuration Protocol
• DHTML—Dynamic Hypertext Markup Language
• DIF—Data Integrity Field
• DIMM—Dual Inline Memory Module
• DIN—Deutsches Institut für Normung
• DIP—Dual In-line Package
• DISM—Deployment Image and Service Management Tool
• DIVX—Digital Video Express
• DKIM—DomainKeys Identified Mail
• DL—Download
• DLL—Dynamic-link library
• DLNA—Digital Living Network Alliance
• DLP—Data loss prevention
• DMA—Direct Memory Access
• DMARC—Domain-based Message Authentication, Reporting and Conformance
• DMCA—Digital Millennium Copyright Act
• DMI—Direct Media Interface
• DML—Data Manipulation Language
• DML—Definitive Media Library
• DMR—Dennis M. Ritchie
• DMZ—Demilitarized Zone
• DN—Distinguished Name
• DNAT—Destination network address translation
• DND—Drag-and-Drop
• DNP3—Distributed Network Protocol 3
• DNS—Domain Name System
• DNSBL—Domain Name System blocklist
• DNSSEC—Domain Name System Security Extensions
• DOA—Dead on Arrival
• DOCSIS—Data Over Cable Service Interface Specification
• DoH—DNS over HTTPS
• DOM—Document Object Model
• DORA—Discover, Offer, Request, Acknowledge
• DoS—Denial of Service
• DOS—Disk Operating System
• DoT—DNS over TLS
• DP—Dot Pitch
• DPC—Deferred Procedure Call
• DPI—Deep packet inspection
• DPI—Dots per inch
• DPMI—DOS Protected Mode Interface
• DPMS—Display Power Management Signaling
• DPO—Data Protection Officer or Data Privacy Officer ^{[2] [3]}
• DR—Disaster Recovery
• DRAM—Dynamic Random-Access Memory
• DRBG—Deterministic random bit generator
• DR-DOS—Digital Research – Disk Operating System
• DRI—Direct Rendering Infrastructure
• DRM—Digital rights management
• DRM—Direct rendering manager
• DROWN—Decrypting RSA with Obsolete and Weakened eNcryption
• DRP—Disaster recovery plan
• DSA—Digital Signature Algorithm
• DSCP—Differentiated services code point
• DSDL—Document Schema Definition Languages
• DSDM—Dynamic Systems Development Method
• DSL—Digital Subscriber Line
• DSL—Domain-Specific Language
• DSLAM—Digital Subscriber Line Access Multiplexer
• DSN—Database Source Name
• DSN—Data Set Name
• DSP—Digital Signal Processor
• DSRC—Dedicated short-range communications
• DSS—Digital Signature Standard
• DSSS—Direct-sequence spread spectrum
• DSSSL—Document Style Semantics and Specification Language
• DTD—Document Type Definition
• DTE—Data Terminal Equipment or data transfer rate
• DTLS—Datagram Transport Layer Security
• DTO—Data Transfer Object
• DTP—Desktop Publishing
• DTR—Data Terminal Ready or Data transfer rate
• DTSTTCPW—"do the simplest thing that could possibly work"
• Dual_EC_DRBG—Dual Elliptic Curve Deterministic Random Bit Generator
• DV—Domain-validated certificate
• DVD—Digital Versatile Disc or Digital Video Disc
• DVD-R—DVD-Recordable
• DVD-ROM—DVD-Read-Only Memory
• DVD-RW—DVD-Rewritable
• DVI—Digital Visual Interface
• DVR—Digital Video Recorder
• DW—Data Warehouse
• DXVA—DirectX Video Acceleration

E

• EAAF—Enterprise Architecture Assessment Framework
• EAI—Enterprise Application Integration
• EAP—Extensible Authentication Protocol
• EAP-AKA—EAP Authentication and Key Agreement
• EAP-AKA'—EAP Authentication and Key Agreement prime
• EAP-EKE—EAP Encrypted Key Exchange
• EAP-FAST—EAP Flexible Authentication via Secure Tunneling
• EAP-GTC—EAP Generic Token Card
• EAP-IKEv2—EAP Internet Key Exchange v. 2
• EAP-MD5—EAP Message Digest 5
• EAP-NOOB—Nimble out-of-band authentication for EAP
• EAP-POTP—EAP Protected One-Time Password
• EAP-PSK—EAP Pre-Shared Key
• EAP-PWD—EAP Password
• EAP-SIM—EAP Subscriber Identity Module
• EAP-TLS—EAP Transport Layer Security
• EAP-TTLS—EAP Tunneled Transport Layer Security
• EAS—Exchange ActiveSync
• EBCDIC—Extended Binary Coded Decimal Interchange Code
• EBML—Extensible Binary Meta Language
• ebXML—Electronic Business using eXtensible Markup Language
• EC2—Amazon Elastic Compute Cloud
• ECB—Electronic codebook
• ECC—Elliptic-curve cryptography
• ECDH—Elliptic-curve Diffie–Hellman
• ECDHE—Elliptic-curve Diffie–Hellman Ephemeral
• ECDSA—Elliptic Curve Digital Signature Algorithm
• ECMA—European Computer Manufacturers Association
• ECN—Explicit Congestion Notification
• ECOS—Embedded Configurable Operating System
• ECRS—Expense and Cost Recovery System
• ECS—Entity-Component-System
• ECU—Electronic control unit
• EDA—Electronic Design Automation
• EDGE—Enhanced Data rates for GSM Evolution
• EDI—Electronic Data Interchange
• EDO—Extended Data Out
• EDR—Endpoint detection and response
• EDSAC—Electronic Delay Storage Automatic Calculator
• EDVAC—Electronic Discrete Variable Automatic Computer
• EEPROM—Electronically Erasable Programmable Read-Only Memory
• EF—Exposure factor
• EFF—Electronic Frontier Foundation
• EFI—Extensible Firmware Interface
• EFM—Eight-to-Fourteen Modulation
• EFM—Ethernet in the first mile
• EFS—Encrypting File System
• EGA—Enhanced Graphics Array
• E-mail—Electronic mail
• EGP—Exterior Gateway Protocol
• eID—electronic ID card
• EIDE—Enhanced IDE
• EIGRP—Enhanced Interior Gateway Routing Protocol
• EISA—Extended Industry Standard Architecture
• EJBCA—Enterprise JavaBeans Certificate Authority
• EKE—Encrypted key exchange
• ELF—Extremely Low Frequency
• ELF—Executable and Linkable Format
• ELM—ELectronic Mail
• EMACS—Editor MACroS
• EMCC—Eckert–Mauchly Computer Corporation
• EMS—Expanded Memory Specification
• ENIAC—Electronic Numerical Integrator And Computer
• EOF—End of File
• EOL—End of Life
• EOL—End of Line
• EOM—End of Message
• EOS—End of Support
• EPC—Electronic Product Code
• EPC—Evolved Packet Core
• EPIC—Explicitly Parallel Instruction Computing
• EPP—Endpoint protection platform
• EPROM—Erasable Programmable Read-Only Memory
• ERD—Entity–Relationship Diagram
• ERGS—Electronic Route Guidance System
• ERM—Entity–Relationship Model
• ERP—Enterprise Resource Planning
• eSATA—external SATA
• ESB—Enterprise service bus
• ESCON—Enterprise Systems Connection
• ESD—Electrostatic Discharge
• ESI—Electronically Stored Information
• ESN—Electronic serial number
• ESP—Encapsulating Security Payload
• ESR—Eric Steven Raymond
• ESS—Extended service set
• ETDR—Endpoint threat detection and response
• ETL—Extract, Transform, Load
• EtM—Encrypt-then-MAC
• E&M—Encrypt-and-MAC
• ETW—Event Tracing for Windows
• EUC—Extended Unix Code
• EULA—End User License Agreement
• EWMH—Extended Window Manager Hints
• EXT—EXTended file system
• ETA—Estimated Time of Arrival
• EV—Extended Validation Certificate

F

• FAP—FORTRAN Assembly Program
• FASM—Flat ASseMbler
• FAST—Flexible Authenication via Secure Tunneling
• FAT—File Allocation Table
• FAQ—Frequently Asked Questions
• FBDIMM—Fully Buffered Dual Inline Memory Module
• FC-AL—Fibre Channel Arbitrated Loop
• FCB—File Control Block
• FCS—Frame Check Sequence
• FDC—Floppy-Disk Controller
• FDD—Frequency-Division Duplexing
• FDD—Floppy Disk Drive
• FDE—Full disk encryption
• FDDI—Fiber Distributed Data Interface
• FDM—Frequency-Division Multiplexing
• FDMA—Frequency-Division Multiple Access
• FDS—Fedora Directory Server
• FE—Frontend
• FEC—Forward Error Correction
• FEMB—Front-End Motherboard
• FET—Field Effect Transistor
• FHS—Filesystem Hierarchy Standard
• FHSS—Frequency-hopping spread spectrum
• FICON—FIber CONnectivity
• FIFO—First In First Out
• FIM—File integrity monitoring
• FIPS—Federal Information Processing Standards
• FIRST—Forum of Incident Response and Security Teams
• FISMA—Federal Information Security Management Act of 2002
• FL—Function Level
• FLAC—Free Lossless Audio Codec
• FLOPS—FLoating-Point Operations Per Second
• FLOSS—Free/Libre/Open-Source Software
• FMC—Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• FOLDOC—Free On-line Dictionary of Computing
• FORTRAN—Formula Translation
• FOSDEM—Free and Open-source Software Developers' European Meeting
• FOSI—Formatted Output Specification Instance
• FOSS—Free and Open-Source Software
• FP—Function Programming
• FP—Functional Programming
• FPGA—Field-programmable gate array
• FPS—Floating Point Systems
• FPU—Floating-Point Unit
• FRR ^[4] —False Rejection Rate ^[5]
• FRU—Field-Replaceable Unit
• FS—File System
• FS—Forward secrecy
• FSB—Front-Side Bus
• fsck—File System Check
• FSF—Free Software Foundation
• FSM—Finite State Machine
• FTP—File Transfer Protocol
• FTPS—FTP-SSL or FTP Secure
• FTTC—Fiber To The Curb
• FTTH—Fiber To The Home
• FTTP—Fiber To The Premises
• FQDN—Fully Qualified Domain Name
• FUD—Fear Uncertainty Doubt
• FWS—Folding White Space
• FXP—File eXchange Protocol
• FYI—For Your Information

G

• G11N—Globalization
• Gas—GNU Assembler
• Gb—Gigabit
• GB—Gigabyte
• Gbps—Gigabits per second
• GC—Garbage collection
• GCC—GNU Compiler Collection
• GCJ—GNU Compiler for Java
• GCM—Galois/Counter Mode
• GCP—Google Cloud Platform
• GCR—Group Coded Recording
• GDB—GNU Debugger
• GDI—Graphics Device Interface
• GDPR—General Data Protection Regulation
• GFDL—GNU Free Documentation License
• GIF—Graphics Interchange Format
• GIGO—Garbage In, Garbage Out
• GIMP—GNU Image Manipulation Program
• GIMPS—Great Internet Mersenne Prime Search
• GIS—Geographic Information System
• GLUT—OpenGL Utility Toolkit
• GML—Geography Markup Language
• GNOME—GNU Network Object Model Environment
• GNU—GNU's Not Unix
• GnuPG or GNU—GNU Privacy Guard
• GnuTLS—GNU Transport Layer Security
• GOMS—Goals, Operators, Methods, and Selection rules
• GPASM—GNU PIC ASseMbler
• GPFS—General Parallel File System
• GPG—GNU Privacy Guard
• GPGPU—General-Purpose Computing on Graphics Processing Units
• GPIB—General-Purpose Instrumentation Bus
• GPL—General Public License
• GPL—General-Purpose Language
• GPO—Group Policy Object
• GPRS—General Packet Radio Service
• GPT—GUID Partition Table
• GPU—Graphics Processing Unit
• GRASP—General Responsibility Assignment Software Patterns
• GRE—Generic routing encapsulation
• GRUB—Grand Unified Boot-Loader
• GERAN—GSM EDGE Radio Access Network
• GSM—Global System for Mobile Communications
• GTC—Generic Token Card
• GTK/GTK+—GIMP Toolkit ^[6]
• GUI—Graphical user interface
• GUID—Globally Unique IDentifier
• GWT—Google Web Toolkit

H

• HA—High availability
• HAL—Hardware Abstraction Layer
• HAN—Home network
• HASP—Houston Automatic Spooling Priority
• HBA—Host Bus Adapter
• HCI—Human—Computer Interaction
• HD—High Density
• HDD—Hard Disk Drive
• HCL—Hardware Compatibility List
• HD DVD—High Definition DVD
• HDL—Hardware Description Language
• HDMI—High-Definition Multimedia Interface
• HECI—Host Embedded Controller Interface
• HF—High Frequency
• HFS—Hierarchical File System
• HHD—Hybrid Hard Drive
• HID—Human Interface Device
• HIDS—Host-based intrusion detection system
• HIG—Human Interface Guidelines
• HIPS—Host-based intrusion prevention system
• HIRD—Hurd of Interfaces Representing Depth
• HLASM—High Level ASseMbler
• HLR—Home location register
• HLS—HTTP Live Streaming
• HMA—High Memory Area
• HMAC—Hash-based message authentication code
• HOTP—HMAC-based one-time password
• HP—Hewlett-Packard
• HPC—High-Performance Computing
• HPFS—High Performance File System
• HSDPA—High-Speed Downlink Packet Access
• HTC—High-Throughput Computing
• HSM—Hardware security module
• HSM—Hierarchical storage management
• HT—Hyper Threading
• HTM—Hierarchical Temporal Memory
• HTML—Hypertext Markup Language
• HTTP—Hypertext Transfer Protocol
• HTTPd—Hypertext Transport Protocol Daemon
• HTTPS—HTTP Secure
• HTX—HyperTransport eXpansion
• HURD—Hird of Unix-Replacing Daemons
• HVD—Holographic Versatile Disc
• Hz—Hertz

I

• I²C—Inter-Integrated Circuit
• I²S—Integrated Interchip Sound
• I18N—Internationalization
• IaaS—Infrastructure as a Service
• IAB—Internet Architecture Board
• IaC—Infrastructure as Code
• IAM—Identity and access management
• IANA—Internet Assigned Numbers Authority
• iBCS—Intel Binary Compatibility Standard
• IBM—International Business Machines
• IBSS—Independent basic service set
• IC—Integrated Circuit
• ICANN—Internet Corporation for Assigned Names and Numbers
• ICE—In-Circuit Emulator
• ICE—Intrusion Countermeasure Electronics
• ICH—I/O Controller Hub
• ICL—International Computers Limited
• ICMP—Internet Control Message Protocol
• ICP—Internet Cache Protocol
• ICS—Industrial control system
• ICS—Internet Connection Sharing
• ICT—Information and Communication Technology
• IDE—Integrated Development Environment
• IDE—Integrated Drive Electronics
• IDEA—International Data Encryption Algorithm
• IDF—Intermediate Data Format
• IDF—Intermediate Distribution Frame
• IDL—Interactive Data Language
• IDL—Interface Definition Language
• IDN—Internationalized domain name
• IdP—Identity provider (cybersecurity)
• IDPS—Intrusion detection and prevention system
• IDS—Intrusion Detection System
• IE—Internet Explorer
• IEC—International Electrotechnical Commission
• IED—Intelligent electronic device
• IEEE—Institute of Electrical and Electronics Engineers
• IEN—Internet Experiment Note
• IETF—Internet Engineering Task Force
• IFL—Integrated Facility for Linux
• IGMP—Internet Group Management Protocol
• IGRP—Interior Gateway Routing Protocol
• IHV—Independent Hardware Vendor
• IIOP—Internet Inter-Orb Protocol
• IIS—Internet Information Services
• IKE—Internet Key Exchange
• IL—Intermediate Language
• IM—Instant Message or Instant Messaging
• IMAP—Internet Message Access Protocol
• IME—Input Method Editor
• INN—InterNetNews
• INFOSEC—Information Systems Security
• I/O—Input/output
• IoT—Internet of Things
• IoC—Indicator of compromise
• IoC—Inversion of control
• IP—Intellectual Property
• IP—Internet Protocol
• IPAM—IP Address Management
• IPC—Inter-Process Communication
• IPL—Initial Program Load
• IPMI—Intelligent Platform Management Interface
• IPO—Inter Procedural Optimization
• IPP—Internet Printing Protocol
• IPS—In-Plane Switching
• IPS—Instructions Per Second
• IPS—Intrusion Prevention System
• IPSJ—Information Processing Society of Japan
• IPsec—Internet Protocol Security
• IPTV—Internet Protocol Television
• IPv4—Internet Protocol version 4
• IPv6—Internet Protocol version 6
• IPX—Internetwork Packet Exchange
• IR—Intermediate representation
• IRC—Internet Relay Chat
• IrDA—Infrared Data Association
• IRI—Internationalized Resource Identifier
• IRP—I/O Request Packet
• IRQ—Interrupt Request
• IRT—Incident response team
• IS—Information Systems
• IS-IS—Intermediate System to Intermediate System
• ISA—Industry Standard Architecture
• ISA—Instruction Set Architecture
• ISAC—Information Sharing and Analysis Center
• ISAKMP—Internet Security Association and Key Management Protocol
• ISAM—Indexed Sequential Access Method
• ISAP—Information Security Automation Program
• ISATAP—Intra-Site Automatic Tunnel Addressing Protocol
• ISC—Internet Storm Center
• iSCSI—Internet Small Computer System Interface
• ISDN—Integrated Services Digital Network
• ISO—International Organization for Standardization
• ISOC—Information security operations center
• ISOC—Internet Society
• iSNS—Internet Storage Name Service
• ISP—Internet Service Provider
• ISPF—Interactive System Productivity Facility
• ISR—Interrupt Service Routine
• ISRG—Internet Security Research Group
• ISSA—Information Systems Security Association
• ISV—Independent Software Vendor
• IT—Information Technology
• ITIL—Information Technology Infrastructure Library
• ITL—Interval Temporal Logic
• ITS—Intelligent transportation system
• ITU—International Telecommunication Union
• ITU-T—International Telecommunication Union Telecommunication Standardization Sector
• IV—Initialization vector
• IVR(S)—Interactive Voice Response (System)

J

• J2EE—Java 2 Enterprise Edition
• J2ME—Java 2 Micro Edition
• J2SE—Java 2 Standard Edition
• JAAS—Java Authentication and Authorization Service
• JAXB—Java Architecture for XML Binding
• JAX-RPC—Jakarta XML (formerly Java XML) for Remote Procedure Calls
• JAXP—Java API for XML Processing
• JBOD—Just a Bunch of Disks
• JCE— Java Cryptography Extension
• JCL—Job Control Language
• JCP—Java Community Process
• JDBC—Java Database Connectivity
• JDK—Java Development Kit
• JEE—Java Enterprise Edition
• JES—Job Entry Subsystem
• JDS—Java Desktop System
• JFC—Java Foundation Classes
• JFET—Junction Field-Effect Transistor
• JFS—IBM Journaling File System
• JINI—Jini Is Not Initials
• JIT—Just-In-Time
• JME—Java Micro Edition
• JMX—Java Management Extensions
• JMS—Java Message Service
• JNDI—Java Naming and Directory Interface
• JNI—Java Native Interface
• JNZ—Jump non-zero
• JPEG—Joint Photographic Experts Group
• JRE—Java Runtime Environment
• JS—JavaScript
• JSE—Java Standard Edition
• JSON—JavaScript Object Notation
• JSP—Jackson Structured Programming
• JSP—JavaServer Pages
• JTAG—Joint Test Action Group
• JVM—Java Virtual Machine
• JWE—JSON Web Encryption
• JWS—JSON Web Signature
• JWT—JSON Web Token

K

• K&R—Kernighan and Ritchie
• K8s—Kubernetes
• Kb—Kilobit
• KB—Keyboard
• KB—Kilobyte
• KB—Knowledge Base
• Kbps—Kilobits per second
• KC—Keyboard computer
• KDC—Key distribution center
• KDE—K Desktop Environment
• KDF—Key derivation function
• KEK—Key encryption key
• kHz—Kilohertz
• KiB—Kibibyte
• KINK—Kerberized Internet Negotiation of Keys
• KML—Keyhole Markup Language
• KPOP—Kerberized Post Office Protocol
• KRACK—Key Reinstallation Attack
• KPK—Key production key
• KRL—Knowledge Representation Language
• KVM—Keyboard, Video, Mouse

L

• L10N—Localization
• L2TP—Layer 2 Tunneling Protocol
• LACP—Link Aggregation Control Protocol
• LAMP—Linux Apache MySQL Perl
• LAMP—Linux Apache MySQL PHP
• LAMP—Linux Apache MySQL Python
• LAN—Local Area Network
• LBA—Logical Block Addressing
• LB—Load Balancer
• LBAC—Lattice-based access control
• LCD—Liquid Crystal Display
• LCDP—Low-code development platform
• LCOS—Liquid Crystal On Silicon
• LCR—Least Cost Routing
• LDAP—Lightweight Directory Access Protocol
• LDIF—LDAP Data Interchange Format
• LE—Logical Extents
• LEAP—Lightweight Extensible Authentication Protocol
• LED—Light-Emitting Diode
• LF—Line Feed
• LF—Low Frequency
• LFS—Linux From Scratch
• LGA—Land Grid Array
• LGPL—Lesser General Public License
• LIB—LIBrary
• LIF—Low Insertion Force
• LIFO—Last In First Out
• LILO—Linux Loader
• LISP—LISt Processing
• LKML—Linux Kernel Mailing List
• LM—Lan Manager
• LOC—Lines of Code
• LPC—Lars Pensjö C
• LPI—Linux Professional Institute
• LPT— Line Print Terminal
• LRU—Least Recently Used
• LSB—Least Significant Bit
• LSB—Linux Standard Base
• LSI—Large-Scale Integration
• LTE—Long Term Evolution
• LTL—Linear Temporal Logic
• LTR—Left-to-Right
• LUG—Linux User Group
• LUN—Logical Unit Number
• LV—Logical Volume
• LVD—Low Voltage Differential
• LVM—Logical Volume Management
• LZW—Lempel-Ziv-Welch

M

• MaaS—Mobility as a service
• MaaS—Monitoring as a service
• MAAWG—Messaging Anti-Abuse Working Group
• MAC—Mandatory access control
• MAC—Medium access control
• MAC—Message authentication code
• MANET—Mobile Ad-Hoc Network
• MAN—Metropolitan Area Network
• MAPI—Messaging Application Programming Interface
• MAPS—Mail Abuse Prevention System
• MAU—Media access unit
• MAU—Medium Attachment Unit
• MAWI—Measurement and Analysis on the WIDE Internet
• Mb—Megabit
• MB—Megabyte
• MBCS—Multi Byte Character Set
• MBD—Model-Based Design
• Mbps—Megabits per second
• MBR—Master Boot Record
• MBSS—Mesh basic service set
• MCA—Micro Channel Architecture
• MCA—Microsoft Certified Architect
• MCAD ^{[ broken anchor ]}—Microsoft Certified Application Developer
• MCAS ^{[ broken anchor ]}—Microsoft Certified Application Specialist
• MCC or MVCC—Multiversion concurrency control
• MCDBA—Microsoft Certified DataBase Administrator
• MCDST ^{[ broken anchor ]}—Microsoft Certified Desktop Support Technician
• MCITP—Microsoft Certified Information Technology Professional
• MCM—Microsoft Certified Master
• MCP—Microsoft Certified Professional
• MCPD—Microsoft Certified Professional Developer
• MCSA ^{[ broken anchor ]}—Microsoft Certified Systems Administrator
• MCSD ^{[ broken anchor ]}—Microsoft Certified Solution Developer
• MCSE ^{[ broken anchor ]}—Microsoft Certified Systems Engineer
• MCT ^{[ broken anchor ]}—Microsoft Certified Trainer
• MCTS—Microsoft Certified Technology Specialist
• MDA—Monochrome Display Adapter
• MDA—Mail Delivery Agent
• MDA—Model-Driven Architecture
• MDD/MDSD—Model-Driven (Software) Development
• MDF—Main Distribution Frame
• MDI—Multiple-Document Interface
• MDM—Master data management
• MDM—Mobile device management
• ME—Microsoft Edge
• ME—[Windows] Millennium Edition
• MF—Medium Frequency
• MFA—Multi-factor authentication
• MFC—Microsoft Foundation Classes
• MFD—Multi-function device
• MFM—Modified Frequency Modulation
• MFP—Multi-function printer
• MFT—Master File Table
• MGCP—Media Gateway Control Protocol
• MHz—Megahertz
• MIB—Management Information Base
• MIC—Message integrity code
• MICKEY—Mutual Irregular Clocking KEYstream generator
• MICR—Magnetic Ink Character Recognition or Magnetic Ink Character Reader
• MIDI—Musical Instrument Digital Interface
• MIMD—Multiple Instruction, Multiple Data
• MIME—Multipurpose Internet Mail Extensions
• MIMO—Multiple-Input Multiple-Output
• MINIX—MIni-uNIX
• MIPS—Microprocessor without Interlocked Pipeline Stages
• MIPS—Million Instructions Per Second
• MISD—Multiple Instruction, Single Data
• MIS—Management Information Systems
• MIT—Massachusetts Institute of Technology
• ML—Machine Learning
• MMC—Microsoft Management Console
• MMC—MultiMediaCard
• MMDS—Mortality Medical Data System
• MMDS—Multichannel Multipoint Distribution Service
• MMF—Multi-Mode (optical) Fiber
• MM fonts—Multiple master fonts
• MMIO—Memory-Mapped I/O
• MMI—Man Machine Interface.
• MMORPG—Massively Multiplayer Online Role-Playing Game
• MMS—Multimedia Message Service
• MMU—Memory Management Unit
• MMX—Multi-Media Extensions
• MNG—Multiple-image Network Graphics
• MoBo—Motherboard
• MOM—Message-Oriented Middleware
• MOO—MUD Object Oriented
• MOP—Meta-Object Protocol
• MOSFET—Metal-Oxide Semiconductor Field Effect Transistor
• MOS ^{[ broken anchor ]}—Microsoft Office Specialist
• MOTD—Message Of The Day
• MoU—Memorandum of understanding
• MOUS—Microsoft Office User Specialist
• MOV—Apple QuickTime Multimedia File
• MPAA—Motion Picture Association of America
• MPEG—Motion Pictures Experts Group
• MPLS—Multiprotocol Label Switching
• MPL—Mozilla Public License
• MPU—Microprocessor Unit
• MQTT—Message Queues Telemetry Transport
• MS—Memory Stick
• MS—Microsoft
• MSA—Master service agreement
• MSA—Message submission agent
• MSB—Most Significant Bit
• MS-CHAP—Microsoft version of the Challenge-Handshake Authentication Protocol
• MSDN—Microsoft Developer Network
• MS-DOS—Microsoft Disk Operating System
• MSI—Medium-Scale Integration
• MSI—Message Signaled Interrupt
• MSI—Microsoft Installer
• MSMQ—Microsoft Message Queuing
• MSN—Microsoft Network
• MSP—Managed service provider
• MSS—Managed security service
• MSSP—Managed security service provider
• MT—Machine Translation
• MTA—Mail Transfer Agent
• MTA—Microsoft Technology Associate
• MTBF—Mean time between failures
• MtE—MAC-then-Encrypt
• MTS—Michigan Terminal System
• MTTF—Mean time to failure
• MTTR—Mean time to repair
• MTU—Maximum Transmission Unit
• MU—Memory Unit
• MUA—Mail User Agent
• MUD—Multi-User Dungeon
• MVC—Model-View-Controller
• MVP—Most Valuable Professional
• MVS—Multiple Virtual Storage
• MWC—Mobile World Congress
• MWN—Municipal wireless network
• MXF—Material Exchange Format
• MX—Mail exchange

N

• NAC—Network access control
• NACK—Negative ACKnowledgement
• NAIC—National Infrastructure Advisory Council
• NAK—Negative AcKnowledge Character
• NaN—Not a Number
• NAP—Network Access Protection
• NAPT—Network address and port translation
• NAS—Network access server
• NAS—Network-attached storage
• NASM—Netwide ASseMbler
• NAT—Network address translation
• NAT-T—Network address translator traversal
• NBO—Northbound interface
• NCDP—No-code development platform
• NCP—NetWare Core Protocol
• NCQ—Native Command Queuing
• NCR—National Cash Register
• NCSA—National Center for Supercomputing Applications
• NDIS—Network Driver Interface Specification
• NDP—Neighbor Discovery Protocol
• NDPS—Novell Distributed Print Services
• NDS—Novell Der irectory Services
• NEP—Network Equipment Provider
• NetBIOS—Network Basic Input/Output System
• NetBT—NetBIOS over TCP/IP
• NEXT—Near-End CrossTalk
• NFA—Nondeterministic Finite Automaton
• NFC—Near-field communication
• NFS—Network File System
• NGFW—Next-generation firewall
• NGSCB—Next-Generation Secure Computing Base
• NI—National Instruments
• NIC—Network Interface Controller or Network Interface Card
• NIDS—Network intrusion detection systems
• NIM—No Internal Message
• NIO—Non-blocking I/O
• NIPS—Network-based intrusion prevention system
• NIST—National Institute of Standards and Technology
• NLE—Non-Linear Editing system
• NLP—Natural Language Processing
• NLS—Native Language Support
• NMI—Non-Maskable Interrupt
• NNRP—Network News Reader Protocol
• NNTP—Network News Transfer Protocol
• NOC—Network Operations Center
• NOOB—Nibble out-of-band authentication
• NOP—No OPeration
• NOS—Network Operating System
• NP—Nondeterministic Polynomial time
• NPL—Netscape Public License
• NPPD—National Protection and Programs Directorate
• NPTL—Native POSIX Thread Library
• NPU—Network Processing Unit
• NS—Netscape
• NSIS—Nullsoft Scriptable Install System
• NSN—Network service name
• NSPR—Netscape Portable Runtime
• NSS—Novell Storage Service
• NSS—Network Security Services
• NSS—Name Service Switch
• NT—New Technology
• NTFS—New Technology File System
• NTLM—New Technology LAN Manager
• NTP—Network Time Protocol
• NUM|A—Non-Uniform Memory Access
• NURBS—Non-Uniform Rational B-Spline
• NUT—Network UPS Tools
• NVD—National Vulnerability Database
• NVMe—NVM Express
• NVR—Network Video Recorder
• NVRAM—Non-Volatile Random-Access Memory
• NX—No-execute

O

• OASIS—Organization for the Advancement of Structured Information Standards
• OAS—Oracle Advanced Security
• OAT—Operational Acceptance Testing
• OAuth—Open Authorization
• OBSAI—Open Base Station Architecture Initiative
• OCR—Optical Character Recognition
• OCSP—Online Certificate Status Protocol
• ODBC—Open Database Connectivity
• OEM—Original Equipment Manufacturer
• OES—Open Enterprise Server
• OFDM—Orthogonal frequency-division multiplexing
• OFTC—Open and Free Technology Community
• OFX—Open Financial eXchange
• OID—Object Identifier
• OKV—Oracle Key Vault
• OLAP—Online Analytical Processing
• OLE—Object Linking and Embedding
• OLED—Organic Light Emitting Diode
• OLPC—One Laptop per Child
• OLTP—Online Transaction Processing
• OMF—Object Module Format
• OMG—Object Management Group
• OMR—Optical Mark Reader
• OMTP—Open Mobile Terminal Platform
• ONS—Oracle Net Services
• ooRexx—Open Object Rexx
• OO—Object-Oriented
• OO—OpenOffice
• OOE—Out-of-Order Execution
• OOM—Out Of Memory
• OOo—OpenOffice.org
• OoOE—Out-of-Order Execution
• OOP—Object-Oriented Programming
• OOTB—Out of the box
• OPML—Outline Processor Markup Language
• ORB—Object Request Broker
• ORBS—Open Relay Behavior-modification System
• ORM—Object–Relational Mapping
• OS—Open Source
• OS—Operating System
• OSCON—O'Reilly Open Source CONvention
• OSDN—Open Source Development Network
• OSI—Open Source Initiative
• OSI—Open Systems Interconnection
• OSINT—Open source intelligence
• OSPF—Open Shortest Path First
• OSS—Open Sound System
• OSS—Open-source software
• OSS—Operations Support System
• OSTG—Open Source Technology Group
• OT—Operational technology
• OTP—One-time password
• OUI—Organizationally Unique Identifier
• OV—Organization validation
• OVAL—Open Vulnerability and Assessment Language
• OWASP—Open Worldwide Application Security Project
• OWE—Opportunistic Wireless Encryption

P

• P2P—Peer-To-Peer
• PaaS—Platform as a Service
• PAC—Proxy auto-config
• PAM—Pluggable Authentication Module
• PAM—Privileged Access Management
• PAN—Personal Area Network
• PAP—Password Authentication Protocol
• PARC—Palo Alto Research Center
• PAT—Port address translation
• PATA—Parallel ATA
• PBKDF2—Password-Based Key Derivation Function 2
• PBS—Portable Batch System
• PBX—Private branch exchange
• PC—Personal Computer
• pcap—packet capture
• PCB—Printed Circuit Board
• PCB—Process Control Block
• PC DOS—Personal Computer Disc Operating System
• PCI—Peripheral Component Interconnect
• PCI DSS—Payment Card Industry Data Security Standard
• PCIe—PCI Express
• PCI-X—PCI Extended
• PCL—Printer Command Language
• PCMCIA—Personal Computer Memory Card International Association
• PCM—Pulse-Code Modulation
• PCRE—Perl Compatible Regular Expressions
• PD—Public Domain
• PDA—Personal Digital Assistant
• PDF—Portable Document Format
• PDH—Plesiochronous Digital Hierarchy
• PDP—Programmed Data Processor
• PDU—Power distribution unit
• PE—Physical Extents
• PE—Portable Executable
• PEAP—Protected Extensible Authentication Protocol
• PEM—Privacy-Enhanced Mail
• PERL—Practical Extraction and Reporting Language
• PERMIS—PrivilEge and Role Management Infrastructure Standards
• PES—Proposed Encryption Standard
• PFS—Perfect forward secrecy
• PG—Peripheral Gateway
• PGA—Pin Grid Array
• PGA—Programmable Gate Array
• PGO—Profile-Guided Optimization
• PGP—Pretty Good Privacy
• PHIPA—Personal Health Information Protection Act
• PHP—Hypertext Preprocessor
• PHR—Personal health record
• PHY—Physical layer
• PIC—Peripheral Interface Controller
• PIC—Programmable Interrupt Controller
• PID—Proportional-Integral-Derivative
• PID—Process ID
• PII—Personally identifiable information
• PIM—Personal Information Manager
• PINE—Program for Internet News and Email
• PING—Packet Internet Gopher
• PIO—Programmed Input/Output
• PIPEDA—Personal Information Protection and Electronic Documents Act
• PIR—Public Interest Registry
• PIV—FIPS 201
• Pixel—Picture element
• PKCS—Public Key Cryptography Standards
• PKI—Public Key Infrastructure
• PLC—Power-Line Communication
• PLC—Programmable logic controller
• PLD—Programmable logic device
• PL/I—Programming Language One
• PL/M—Programming Language for Microcomputers
• PL/P—Programming Language for Prime
• PLT—Power-Line Telecommunications
• PMM—POST Memory Manager
• PNAC—Port-based network access control
• PNA—Personal Navigation Assistant
• PNG—Portable Network Graphics
• PnP—Plug-and-Play
• PNRP—Peer Name Resolution Protocol
• POCE—Personally owned, company enabled
• POCO—Plain Old Class Object
• PoE—Power over Ethernet
• POID—Persistent Object Identifier
• POJO—Plain Old Java Object
• POODLE—Padding Oracle On Downgraded Legacy Encryption
• PoP—Point of Presence
• POP3—Post Office Protocol v3
• PoS—Point of Sale
• POSIX—Portable Operating System Interface, formerly IEEE-IX
• POST—Power-On Self Test
• POTP—Protected One-Time Password
• POTS—Plain old telephone service
• PPC—PowerPC
• PPI—Pixels Per Inch
• PPM—Pages Per Minute
• PPP—Point-to-Point Protocol
• PPPoA—PPP over ATM
• PPPoE—PPP over Ethernet
• PPTP—Point-to-Point Tunneling Protocol
• PR—Pull Request
• PRNG—Pseudorandom number generator
• PROM—Programmable Read-Only Memory
• PS—PostScript
• PS/2—Personal System/2
• PSA—Professional Services Automation
• PSK—Pre-shared key
• PSM—Platform Specific Model
• PSTN—Public Switched Telephone Network
• PSU—Power Supply Unit
• PSVI—Post-Schema-Validation Infoset
• PTS-DOS—PhysTechSoft – Disk Operating System
• PTZ—Pan–tilt–zoom camera
• PUA—Potentially unwanted application
• PUP—Potentially unwanted program
• PV—Physical volume
• PV—Process variable
• PVG—Physical volume group
• PVR—Personal Video Recorder
• PXE—Preboot Execution Environment
• PXI—PCI eXtensions for Instrumentation
• PRC—Procedure Remote Call

Q

• QA—Quality assurance
• QC—Quality control
• QC—Quick Charge
• QDR—Quad Data Rate
• QEMU—Quick Emulator
• QFP—Quad Flat Package
• QIF—Quicken Interchange Format
• QoS—Quality of Service
• QOTD—Quote of the Day
• QSOP—Quarter-size small-outline package
• Qt—a cross-platform application development framework for creating graphical user interfaces as well as applications that run on various software and hardware platforms
• QTAM—Queued Teleprocessing Access Method

R

• RA—Registration authority
• RACE—Research and Development in Advanced Communications Technologies in Europe
• RACF—Resource Access Control Facility
• RAD—Rapid Application Development
• RADIUS—Remote Authentication Dial-In User Service
• RAID—Redundant Array of Independent Disks
• RAII—Resource Acquisition Is Initialization
• RAIT—Redundant Array of Inexpensive Tapes
• RAM—Random-Access Memory
• RAM—Reliability, Availability, and Maintainability
• RAN—Radio access network
• RARP—Reverse Address Resolution Protocol
• RAS—Reliability, Availability, and Serviceability
• RAS—Remote access service
• RAT—Radio access technology
• RAT—Remote access trojan
• RBAC—Role-based access control
• RC—Region Code
• RC—Release Candidate
• RC—Run Commands
• RC2—Rivest Cipher 2 (a block cipher)
• RC4—Rivest Cipher 4 (a stream cipher)
• RC5—Rivest Cipher 5 (a block cipher)
• RC6—Rivest Cipher 6 (a block cipher)
• RCA—Root Cause Analysis
• RCS—Revision Control System
• RD—Remote Desktop
• rd—remove directory
• RDBMS—Relational Database Management System
• RDC—Remote Desktop Connection
• RDF—Resource Description Framework
• RDM—Relational Data Model
• RDOS—Real-time Disk Operating System
• RDP—Remote Desktop Protocol
• RDS—Remote Desktop Services
• REFAL—Recursive Functions Algorithmic Language
• REST—Representational State Transfer
• regex—Regular Expression
• regexp—Regular Expression
• RF—Radio Frequency
• RFB—Remote FrameBuffer
• RFC—Request For Comments
• RFI—Radio Frequency Interference
• RFID—Radio-frequency identification
• RGB—Red, Green, Blue
• RHL—Red Hat Linux
• RHEL—Red Hat Enterprise Linux
• REXX—Restructured Extended Executor Language
• RIA—Rich Internet Application
• RIAA—Recording Industry Association of America
• RIP—Raster Image Processor
• RIP—Routing Information Protocol
• RIPE—Réseaux IP Européens
• RIPEMD—RACE Integrity Primitives Evaluation Message Digest
• RIPEMD—RIPE Message Digest
• RIR—Regional Internet registry
• RISC—Reduced Instruction Set Computer
• RISC OS—Reduced Instruction Set Computer Operating System
• RJE—Remote Job Entry
• RLE—Run-Length Encoding
• RLL—Run-Length Limited
• rmdir—remove directory
• RMF—Risk Management Framework
• RMI—Remote Method Invocation
• RMS—Richard Matthew Stallman
• ROM—Read-Only Memory
• ROMB—Read-Out Motherboard
• ROM-DOS—Read-Only Memory – Disk Operating System
• RPA—Robotic Process Automation
• RPC—Remote Procedure Call
• RPG—Report Program Generator
• RPM—RPM Package Manager
• RPO—Recovery Point Objective
• RRAS—Routing and Remote Access Service
• RRSIG—Resource record signature
• RSA—Rivest Shamir Adleman
• RSBAC—Rule-set-based access control
• RSI—Repetitive Strain Injury
• RSR—Rapid Security Response
• RSS—Radio Service Software
• RSS—Remote service software
• RSS—Rich Site Summary, RDF Site Summary, or Really Simple Syndication
• RST—reStructuredText
• RSTP—Rapid Spanning Tree Protocol
• RSVP—Resource Reservation Protocol
• RTAI—Real-Time Application Interface
• RTBH—Remote Triggered Black Hole Filtering
• RTC—Real-Time Clock
• RTD—Round-trip delay
• RTE—Real-Time Enterprise
• RTEMS—Real-Time Executive for Multiprocessor Systems
• RTF—Rich Text Format
• RTL—Right-to-Left
• RTMP—Real Time Messaging Protocol
• RTO—Recovery Time Objective
• RTOS—Real-Time Operating System
• RTP—Real-time Transport Protocol
• RTS—Ready To Send
• RTSP—Real-Time Streaming Protocol
• RTT—Round-trip time
• RTTI—Run-time Type Information
• RTU—Remote Terminal Unit
• RWD—Responsive Web Design

S

• SA—Security association
• SaaS—Software as a Service
• SAE—Simultaneous Authentication of Equals
• SAE—System Architecture Evolution
• SASE—Secure access service edge
• SASS—Syntactically Awesome Style Sheets
• SAM—Security Account Manager
• SAML—Security Assertion Markup Language
• SAN—Storage Area Network
• SAN—Subject Alternative Name
• SAS—Serial attached SCSI
• SASE—Secure access service edge
• SASE—Stand-alone synchronization equipment
• SASL—Simple Authentication and Security Layer
• SATA—Serial AT Attachment
• SAX—Simple API for XML
• SBOD—Spinning Beachball of Death
• SBP-2—Serial Bus Protocol 2
• sbin—superuser binary
• sbs—Small Business Server
• SCADA—Supervisory Control and Data Acquisition
• SCAP—Security Content Automation Protocol
• SCEP—Simple Certificate Enrollment Protocol
• SCCM—System Center Configuration Manager
• SCID—Source Code in Database
• SCM—Software Configuration Management
• SCM—Source Code Management
• SCP—Seattle Computer Products
• SCP—Secure copy protocol
• SCRAM—Salted Challenge Response Authentication Mechanism
• SCSI—Small Computer System Interface
• SCTP—Stream Control Transmission Protocol
• SD—Secure Digital
• SDD—Software design description
• SDDC—Software-defined data center
• SDDL—Security Descriptor Definition Language
• SDH—Synchronous Digital Hierarchy
• SDI—Single-Document Interface
• SDIO—Secure Digital Input Output
• SDK—Software Development Kit
• SDL—Simple DirectMedia Layer
• SDLC—Software development life cycle
• SDN—Software-defined networking
• SDP—Session Description Protocol
• SDP—Software-defined protection
• SDR—Software-Defined Radio
• SDRAM—Synchronous Dynamic Random-Access Memory
• SDSL—Symmetric digital subscriber line
• SD-WAN—Software-Defined Wide Area Network
• SDXF—Structured Data eXchange Format
• SE—Single Ended
• SECC—Single-Edged Contact Cartridge
• SED—Self-encrypting drive
• SEH—Structured Exception Handling
• SEI—Software Engineering Institute
• SELinux—Security-Enhanced Linux
• SEO—Search Engine Optimization
• SFC—Sequential function chart
• SFC—System File Checker
• SFTP—Secure File Transfer Protocol
• SFTP—Simple File Transfer Protocol
• SFTP—SSH File Transfer Protocol
• SGI—Silicon Graphics, Incorporated
• SGML—Standard Generalized Markup Language
• SGR—Select Graphic Rendition]]
• SGX—Software Guard eXtensions
• SHA—Secure Hash Algorithms
• SHA-1—Secure Hash Algorithm 1
• SHA-2—Secure Hash Algorithm 2
• SHA-3—Secure Hash Algorithm 3
• SHDSL—Single-pair High-speed Digital Subscriber Line
• S-HTTP—Secure Hypertext Transfer Protocol
• SIEM—Security information and event management
• SIGCAT—Special Interest Group on CD-ROM Applications and Technology
• SIGGRAPH—Special Interest Group on Graphics
• SIMD—Single Instruction, Multiple Data
• SIM—Subscriber Identity Module
• SIMM—Single Inline Memory Module
• SIP—Session Initiation Protocol
• SIP—Supplementary Ideographic Plane
• SISD—Single Instruction, Single Data
• SISO—Single-Input and Single-Output
• SLA—Service-level agreement
• SLAAC—Stateless address autoconfiguration
• SLE—Single-loss expectancy
• SLED—SUSE Linux Enterprise Desktop
• SLES—SUSE Linux Enterprise Server
• SLI—Scalable Link Interface
• SLIP—Serial Line Internet Protocol
• SLM—Service Level Management
• SLOC—Source Lines of Code
• SME—Subject Matter Expert
• SMF—Single-Mode (optical) Fiber
• SPM—Software project management
• SPMD—Single Program, Multiple Data
• SPOF—Single point of failure
• SMA—SubMiniature version A
• SMB—Server Message Block
• SMBIOS—System Management BIOS
• SMIL—Synchronized Multimedia Integration Language
• S/MIME—Secure/Multipurpose Internet Mail Extensions
• SMP—Supplementary Multilingual Plane
• SMP—Symmetric Multi-Processing
• SMPS—Switch Mode Power Supply
• SMS—Short Message Service
• SMS—System Management Server
• SMT—Simultaneous Multithreading
• SMTP—Simple Mail Transfer Protocol
• SMTPS—Simple Mail Transfer Protocol Secure
• SNA—Systems Network Architecture
• SNMP—Simple Network Management Protocol
• SNP—Secure Network Programming
• SNTP—Simple Network Time Protocol
• SOA—Service-Oriented Architecture
• SOAP—Simple Object Access Protocol
• SOAP—Symbolic Optimal Assembly Program
• SOAR—Security orchestration, automation and response
• SOC—Security operations center
• SOC—System and Organization Controls
• SoC—System on a chip
• SO-DIMM—Small Outline DIMM
• SOE—Standard Operating Environment
• SOHO—Small Office/Home Office
• SOI—Silicon On Insulator
• SOLID—Single-responsibility, Open-closed, Liskov substitution, Interface segregation, Dependency Inversion
• SOPA—Stop Online Piracy Act
• SOW—Statement of work
• SP—Service Pack
• SPA—Single Page Application
• SPF—Sender Policy Framework
• SPI—Serial Peripheral Interface
• SPI—Stateful Packet Inspection
• SPICE—Simple Protocol for Independent Computing Environments
• SPIM—Spam over instant messaging ^{[7] [8]}
• SPARC—Scalable Processor Architecture
• SPOF—Single point of failure
• SQL—Structured Query Language
• SQLi—SQL injection
• SRAM—Static Random-Access Memory
• SRP—Single-responsibility principle
• SRTP—Secure Real-time Transport Protocol
• SSA—Static Single Assignment
• SSD—Software Specification Document
• SSD—Solid-State Drive
• SSDP—Simple Service Discovery Protocol
• SSE—Streaming SIMD Extensions
• SSH—Secure Shell
• SSI—Server Side Includes
• SSI—Single-System Image
• SSI—Small-Scale Integration
• SSID—Service set identifier
• SSL—Secure Sockets Layer
• SSO—Single sign-on
• SSP—Supplementary Special-purpose Plane
• SSSE—Supplementary Streaming SIMD Extensions
• SSSP—Single Source Shortest Path
• SSTC—Security Services Technical Committee
• SSTP—Secure Socket Tunneling Protocol
• STIX—Scientific and Technical Information eXchange
• STOMP—Simple (or Streaming) Text Oriented Messaging Protocol
• STP—Spanning Tree Protocol
• STUN—Session Traversal Utilities for NAT
• su—superuser
• SUS—Single UNIX Specification
• SUSE—Software und System-Entwicklung
• SVC—Scalable Video Coding
• SVC—Static VAR compensator
• SVD—Structured VLSI Design
• SVG—Scalable Vector Graphics
• SVGA—Super Video Graphics Array
• SVOT—Single version of the truth
• SWF—Shock Wave Flash
• SWG—Secure Web Gateway
• SWT—Standard Widget Toolkit
• Sysop—System operator

T

• TAO—Track-At-Once
• TACACS—Terminal Access Controller Access-Control System
• TAP—Test Access Port
• TAPI—Telephony Application Programming Interface
• TASM—Turbo ASseMbler
• TAXII—Trusted Automated eXchange of Indicator Information
• TB—TeraByte
• Tcl—Tool Command Language
• TCM—The Computer Museum
• TCP—Transmission Control Protocol
• TCP/IP—Transmission Control Protocol/Internet Protocol
• TCSEC—Trusted Computer System Evaluation Criteria
• TCU—Telecommunication Control Unit|
• TDE—Transparent data encryption
• TDEA—Triple Data Encryption Algorithm
• TDES—Triple Data Encryption Standard
• TDMA—Time-Division Multiple Access
• TDP—Thermal Design Power
• TEAP—Tunnel Extensible Authentication Protocol
• TEE—Trusted execution environment
• TFT—Thin-Film Transistor
• TFTP—Trivial File Transfer Protocol
• TGS—Ticket Granting Service
• TGT—Ticket Granting Ticket
• THE—The Hessling Editor
• TI—Texas Instruments
• TIFF—Tagged Image File Format
• TKIP—Temporal Key Integrity Protocol
• TLA—Three-Letter Acronym
• TLD—Top-Level Domain
• TLS—Thread-Local Storage
• TLS—Transport Layer Security
• TLV—Type—length—value
• TM—Translation memory
• TMM—Testing Maturity Model
• tmp—temporary
• TMS—Translation management system
• TNC—Terminal Node Controller
• TNC—Threaded Neill-Concelman connector
• TOCTOU, TOCTTOU or TOC/TOU—Time-of-check to time-of-use
• TOTP—Time-based one-time password
• TPF—Transaction Processing Facility
• TPM—Trusted Platform Module
• TROFF—Trace Off
• TRON—Trace On
• TRON—The Real-time Operating system Nucleus
• TRSDOS—Tandy Radio Shack – Disk Operating System
• TS—Timestamp
• TSIG—Transaction signature
• TSO—Time Sharing Option
• TSP—Traveling Salesman Problem
• TSR—Terminate and Stay Resident
• TTF—TrueType Font
• TTL—Transistor—Transistor Logic
• TTLS—Tunneled Transport Layer Security
• TTL—Time To Live
• TTP—Tesla Transport Protocol
• TTP—Time-Triggered Protocol
• TTP—Trusted third party
• TTS—Text-to-Speech
• TTY—Teletype
• TUCOWS—The Ultimate Collection of Winsock Software
• TUG—TeX Users Group
• TURN—-Traversal Using Relays around NAT
• TWAIN—Technology Without An Interesting Name

U

• UAAG—User Agent Accessibility Guidelines
• UAC—User Account Control
• UART—Universal Asynchronous Receiver/Transmitter
• UAS—Unmanned aircraft system
• UAT—User Acceptance Testing
• UAV—Unmanned aerial vehicle
• UB—Undefined Behavior
• UBA—User behavior analytics
• UCS—Universal Character Set
• UDDI—Universal Description, Discovery, and Integration
• UDMA—Ultra DMA
• UDP—User Datagram Protocol
• UEBA—User and entity behavior analytics
• UEFI—Unified Extensible Firmware Interface
• UEM—Unified endpoint management
• UHF—Ultra High Frequency
• UI—User Interface
• UIMA—Unstructured Information Management Architecture
• UL—Upload
• ULA—Uncommitted Logic Array
• ULSI—Ultra Large Scale Integration
• UMA—Upper Memory Area
• UMB—Upper Memory Block
• UML—Unified Modeling Language
• UML—User-Mode Linux
• UMPC—Ultra-Mobile Personal Computer
• UMTS—Universal Mobile Telecommunications System
• UNC—Universal Naming Convention
• UNIVAC—Universal Automatic Computer (By MKS)
• UPS—Uninterruptible Power Supply or Uninterrupted Power Supply
• URI—Uniform Resource Identifier
• URL—Uniform Resource Locator
• URN—Uniform Resource Name
• USB—Universal Serial Bus
• US-CERT—United States Computer Emergency Readiness Team
• usr—User System Resources
• USR—U.S. Robotics
• UTC—Coordinated Universal Time
• UTF—Unicode Transformation Format
• UTM—Unified Threat Management
• UTP—Unshielded Twisted Pair
• UTRAN—Universal Terrestrial Radio Access Network
• UUCP—Unix to Unix Copy
• UUID—Universally Unique Identifier
• UVC—Universal Virtual Computer
• UWP—Universal Windows Platform
• UX—User Experience

V

• V2X—Vehicle-to-everything
• var—variable
• VaR—Value at risk
• VAX—Virtual Address eXtension
• VB—Visual Basic
• VBA—Visual Basic for Applications
• VBS—Visual Basic Script
• VCPI—Virtual Control Program Interface
• VDC—Virtual data center
• VDE—Virtual Desktop Environment
• VDI—Virtual Desktop Infrastructure
• VDM—Virtual DOS machine
• VDS—Virtual dedicated server
• VDSL—Very High Bitrate Digital Subscriber Line
• VDU—Visual Display Unit
• VDX—Virtual Desktop eXtender
• VESA—Video Electronics Standards Association
• VFAT—Virtual File Allocation Table
• VFO—Variable-frequency oscillator
• VFS—Virtual File System
• VHD—Virtual Hard Disk
• VG—Volume Group
• VGA—Video Graphics Array
• VHF—Very High Frequency
• VLAN—Virtual Local Area Network
• VLB—Vesa Local Bus
• VLF—Very Low Frequency
• VLIW—Very Long Instruction Word
• VLSI—Very-Large-Scale Integration
• VLSM—Variable-length subnet masking
• VM—Virtual Machine
• VM—Virtual Memory
• VMM—Virtual Machine Monitor
• VNC—Virtual Network Computing
• VOD—Video On Demand
• VoIP—Voice over Internet Protocol
• VoLTE—Voice Over Long Term Evolution
• VPC—Virtual private cloud
• VPN—Virtual private network
• VPS—Virtual private server
• VPU—Visual Processing Unit
• VR—Virtual Reality
• VRAM—Video Random-Access Memory
• VRML—Virtual Reality Modeling Language
• VSAM—Virtual Storage-Access Method
• VSAT—Very Small Aperture Terminal
• VT—Video Terminal
• VTAM—Virtual Telecommunications Access Method
• VTL—Virtual Tape Library

W

• W3C—World Wide Web Consortium
• WAF—Web application firewall
• WAFS—Wide Area File Services
• WAI—Web Accessibility Initiative
• WAIS—Wide Area Information Server
• WAN—Wide Area Network
• WAP—Wireless Access Point
• WAP—Wireless Application Protocol
• WASM—Watcom ASseMbler
• WAVE—Wireless access in vehicular environments
• WBEM—Web-Based Enterprise Management
• WBS—Work breakdown structure
• WCAG—Web Content Accessibility Guidelines
• WCF—Windows Communication Foundation
• WDDM—Windows Display Driver Model
• WDM—Wavelength-Division Multiplexing
• WDM—Windows Driver Model
• WebDAV—WWW Distributed Authoring and Versioning
• WEP—Wired Equivalent Privacy
• WFI—Wait For Interrupt
• WIDE—Widely Integrated Distributed Environment
• WIDS—Wireless intrusion detection system
• WiMAX—Worldwide Interoperability for Microwave Access
• WinFS—Windows Future Storage
• WinRT—Windows RunTime
• WINS—Windows Internet Name Service
• WIPS—Wireless intrusion prevention system
• WLAN—Wireless Local Area Network
• WMA—Windows Media Audio
• WMI—Windows Management Instrumentation
• WMV—Windows Media Video
• WNS—Windows Push Notification Service
• WOL—Wake-on-LAN
• WOR—Wake-on-Ring
• WORA—Write once, run anywhere
• WORE—Write once, run everywhere
• WORM—Write Once Read Many
• WPA—Wi-Fi Protected Access
• WPAD—Web Proxy Autodiscovery Protocol
• WPAN—Wireless Personal Area Network
• WPF—Windows Presentation Foundation
• WPS—Wi-Fi Protected Setup
• WS-D—Web Services Dynamic Discovery
• WSDL—Web Services Description Language
• WSFL—Web Services Flow Language
• WTLS—Wireless Transport Layer Security
• WUSB—Wireless Universal Serial Bus
• WWAN—Wireless Wide Area Network
• WWDC—Apple World Wide Developer Conference
• WWID—World Wide Identifier
• WWN—World Wide Name
• WWW—World Wide Web
• WYSIWYG—What You See Is What You Get
• WZC—Wireless Zero Configuration

X

• XACML—eXtensible Access Control Markup Language
• XAML—eXtensible Application Markup Language
• XDM—X Window Display Manager
• XDMCP—X Display Manager Control Protocol
• XCBL—XML Common Business Library
• XDR—eXtended detection and response
• XHTML—eXtensible Hypertext Markup Language
• XILP—X Interactive ListProc
• XML—eXtensible Markup Language
• XMMS—X Multimedia System
• XMPP—eXtensible Messaging and Presence Protocol
• XMS—eXtended Memory Specification
• XNS—Xerox Network Systems
• XP—Cross-Platform
• XP—eXtreme Programming
• XPCOM—Cross Platform Component Object Model
• XPI—XPInstall
• XPIDL—Cross-Platform IDL
• XPS—XML Paper Specification
• XSD—XML Schema Definition
• XSL—eXtensible Stylesheet Language
• XSL-FO—eXtensible Stylesheet Language Formatting Objects
• XSLT—eXtensible Stylesheet Language Transformations
• XSRF—Cross-site request forgery
• XSS—Cross-Site Scripting
• XTACACS—eXtended Terminal Access Controller Access-Control System
• XTF—eXtensible Tag Framework
• XTF—eXtended Triton Format
• XUL—XML User Interface Language
• XVGA—eXtended Video Graphics Adapter

Y

• Y2K—Year Two Thousand
• Y2K38—Year Two Thousand Thirty Eight
• YACC—Yet Another Compiler Compiler
• YAGNI—You Aren't Gonna Need It
• YAML—YAML Ain't Markup Language
• YARN—Yet Another Resource Negotiator
• YaST—Yet another Setup Tool

Z

• ZCAV—Zone Constant Angular Velocity
• ZCS—Zero Code Suppression
• ZIF—Zero Insertion Force
• ZIFS—Zero Insertion Force Socket
• ZIP—ZIP file archive
• ZISC—Zero Instruction Set Computer
• ZOI—Zero One Infinity
• ZOPE—Z Object Publishing Environment
• ZMA—Zone Multicast Address
• ZPL—Z-level Programming Language

See also

• Acronym
• Internet slang
• List of file formats
• List of information technology initialisms

References

1. Ledesma, Josue (16 June 2023). "What is the CIA Triad?". Varonis. Retrieved 13 July 2025.
2. "What is a Data Privacy Officer?". © 2025 Teal Labs, Inc. Retrieved 13 July 2025.
3. University of Tulsa (29 January 2025). "Data Privacy Officer: Job Description and Salary" . Retrieved 13 July 2025.
4. "Overview: False Rejection Rate (FRR)". © 2025 Plurilock Security Inc. Retrieved 14 July 2025.
5. "What Does False Rejection Rate FRR Mean And Its Importance?". © 2025 Microblink. 24 October 2023. Retrieved 14 July 2025.
6. Hackvän, Stig. "LinuxWorld - Where did Spencer Kimball and Peter Mattis go?". Archived from the original on 17 April 1999. Retrieved 2013-08-19.
7. Baldikov, Nikola (24 February 2022). "What Is SPIM (Spam Over Instant Messaging)?". Brosix. Retrieved 13 July 2025.
8. Alam, Asloob (24 February 2023). "What is SPIM (Spam Over Instant Messaging)?". Troop Messenger. Retrieved 13 July 2025.

• "Computing Acronyms and Abbreviations". All Acronyms. Retrieved 2008-07-12.

External links

• The UNIX Acronym List