An abbreviation is a shortened form of a word or phrase, by any method. It may consist of a group of letters or words taken from the full version of the word or phrase; for example, the word abbreviation itself can be abbreviated as abbr., abbrv., or abbrev.. It may also consist of initials only, a mixture of initials and words, or words or letters representing words in another language. Some types of abbreviations are acronyms or grammatical contractions or crasis.
A three-letter acronym (TLA), or three-letter abbreviation, is an abbreviation consisting of three letters. These are usually the initial letters of the words of the phrase abbreviated, and are written in capital letters ; three-letter abbreviations such as etc. and Mrs. are not three-letter acronyms, but "TLA" itself is a TLA.
MSISDN is a number uniquely identifying a subscription in a Global System for Mobile communications or a Universal Mobile Telecommunications System mobile network. It is the mapping of the telephone number to the subscriber identity module in a mobile or cellular phone. This abbreviation has several interpretations, the most common one being "Mobile Station International Subscriber Directory Number".
An acronym is a word or name consisting of parts of the full name's words. Sometimes, initialism or alphabetism is used to refer to acronyms formed from the string of initials which are usually pronounced as individual letters, as in the FBI . But acronyms sometimes use syllables instead, as in Benelux, NAPOCOR, and TRANSCO. They can also be a mixture, as in radar and MIDAS.
Abbreviations are a common part of the Hebrew language, with many organizations, places, people and concepts known by their abbreviations.