This article may be too long to read and navigate comfortably. Please consider splitting content into sub-articles, condensing it, or adding subheadings. Please discuss this issue on the article's talk page.(April 2022)
It also has thousands of ideographic variation sequences registered in the Unicode Ideographic Variation Database (IVD).[4][5] These sequences specify the desired glyph variant for a given Unicode character.
It was the only CJK Unified Ideographs Extension block with a UCS2003 source identifier. Since Extension B contained too many characters, the original code charts were produced with a single glyph for all regions. The glyphs were designed by Beijing Zhongyi Electronic Ltd. After the introduction of multi-column code charts on Unicode 5.2, the original glyphs were retained under the UCS2003 source identifier; they were then removed in Unicode 14.0, being redundant as well as misleading.[6] The glyphs are packaged in the "SimSun-ExtB" font distributed with the Simplified Chinese versions of Windows, and do not adhere to the glyphs for the Mainland China region.
Known issues
Unifiable variants and exact duplicates in Extension B
Also in CJK Unified Ideographs Extension B, hundreds of glyph variants were encoded.[7] In addition to the deliberate encoding of close glyph variants, six exact duplicates (where the same character has inadvertently been encoded twice) and two semi-duplicates (where the CJK-B character represents a de facto disunification of two glyph forms unified in the corresponding BMP character) were encoded by mistake:[8]
U+34A8 㒨 = U+20457 𠑗: U+20457 is the same as the China-source glyph for U+34A8, but it is significantly different from the Taiwan-source glyph for U+34A8
U+3DB7 㶷 = U+2420E 𤈎: same glyph shapes
U+8641 虁 = U+27144 𧅄: U+27144 is the same as the Korean-source glyph for U+8641, but it is significantly different from the Chinese Mainland-, Taiwan- and Japan-source glyphs for U+8641
U+204F2 𠓲 = U+23515 𣔕: same glyph shapes, but ordered under different radicals
U+249BC 𤦼 = U+249E9 𤧩: same glyph shapes
U+24BD2 𤯒 = U+2A415 𪐕: same glyph shapes, but ordered under different radicals
U+26842 𦡂 = U+26866 𦡦: same glyph shapes
U+FA23 﨣 = U+27EAF 𧺯: same glyph shapes (U+FA23 﨣 is a unified CJK ideograph, despite its name "CJK COMPATIBILITY IDEOGRAPH-FA23.")
Block
This list is a single Unicode block. For an overview of all CJK ideograph blocks in Unicode, see CJK Unified Ideographs.
The following Unicode-related documents record the purpose and process of defining specific characters in the CJK Unified Ideographs Extension B block:
Umamaheswaran, V. S.; Sargent, Murray (2000-02-03), Expert contribution on the placement of additional unified ideographs from JIS X0213, HK, and Korea
Sato, T. K. (2001-03-28), Notification of an error and request for a correction regarding mapping information for a particular JIS X 0213 character in CJK UNIFIED IDEOGRAPHS EXTENSION-B
Chan, Eiso (2017-06-02), Request for consideration to add kIRG_GSource values to thirteen ideographs and change two G-source glyphs for the Table of General Standard Chinese Characters [Affects U+20164]
Shin, Sanghyun; Cho, Sungduk; Pyo, Seungju; Kim, Kyongsok (2018-12-13), Request to move character K6-1022 in Horizontal Extension of KS X 1027-5 from U+3EAC to U+248F2
Proposal of China's horizontal extension for technical used characters [Affects U+23496, U+2355E, U+236ED, U+24726, U+26FE1, U+27334 and U+2A38C], 2019-05-10
Lunde, Ken (2022-11-01), "03) 2022-08-08 07:25:17 CDT [Affects 29530], 24) L2/22-256, 26) L2/22-259, and 35) L2/22-238", CJK & Unihan Group Recommendations for UTC #173 Meeting
Lunde, Ken (2023-01-11), "11) L2/22-238: Proposal to consider adding CodeCharts support for kIRG_KPSource representative glyphs [Affects U+23CC0, 23CD9, 249D6, 249E8, and 24D6A]", CJK & Unihan Group Recommendations for UTC #174 Meeting
Constable, Peter (2023-05-01), "E.1 Section 27", UTC #175 Minutes, Accept the proposal to change the G-source representative glyphs for U+25D89 and U+28BBA
Moore, Lisa (2020-10-27), "Consensus 165-C9", UTC #165 Minutes
↑ Proposed code points and characters names may differ from final code points and names
Related Research Articles
Han unification is an effort by the authors of Unicode and the Universal Character Set to map multiple character sets of the Han characters of the so-called CJK languages into a single set of unified characters. Han characters are a feature shared in common by written Chinese (hanzi), Japanese (kanji), Korean (hanja) and Vietnamese.
GB 18030 is a Chinese government standard, described as Information Technology — Chinese coded character set and defines the required language and character support necessary for software in China. GB18030 is the registered Internet name for the official character set of the People's Republic of China (PRC) superseding GB2312. As a Unicode Transformation Format, GB18030 supports both simplified and traditional Chinese characters characters. It is also compatible with legacy encodings including GB2312, CP926, and GBK 1.0.
The Ideographic Research Group (IRG), formerly called the Ideographic Rapporteur Group, is a subgroup of Working Group 2 (WG2) of ISO/IEC JTC 1/SC 2, the subcommittee of the Joint Technical Committee of ISO and IEC which is responsible for developing standards within the field of coded character sets. IRG is composed of experts from China, Japan, South Korea, Vietnam and other countries and regions that use Han characters, as well as experts representing the Unicode Consortium. The group is responsible for coordinating the addition of new CJK unified ideographs to the Universal Multiple-Octet Coded Character Set and the Unicode Standard. The group meets twice a year for 4-5 days each time, and reports its activity to the subsequent meeting of WG2.
Mojikyō, also known by its full name Konjaku Mojikyō, is a character encoding scheme. The Mojikyō Institute, which published the character set, also published computer software and TrueType fonts to accompany it. The Mojikyō Institute, chaired by Tadahisa Ishikawa (石川忠久), originally had its character set and related software and data redistributed on CD-ROMs sold in Kinokuniya stores.
The Chinese character description languages are several proposed languages to most accurately and completely describe Chinese characters and information such as their list of components, list of strokes, their order, and the location of each of them on a background empty square. They are designed to overcome the inherent lack of information within a bitmap description. This enriched information can be used to identify variants of characters that are unified into one code point by Unicode and ISO/IEC 10646, as well as to provide an alternative form of representation for rare characters that do not yet have a standardized encoding in Unicode or ISO/IEC 10646. Many aim to work for Kaishu style and Song style, as well as to provide the character's internal structure which can be used for easier look-up of a character by indexing the character's internal make-up and cross-referencing among similar characters.
Biangbiang noodles, alternatively known as youpo chemian (油泼扯面) in Chinese, are a type of Chinese noodle originating from Shaanxi cuisine. The noodles, touted as one of the "eight curiosities" of Shaanxi (陕西八大怪), are described as being like a belt, owing to their thickness and length.
The Chinese, Japanese and Korean (CJK) scripts share a common background, collectively known as CJK characters. During the process called Han unification, the common (shared) characters were identified and named CJK Unified Ideographs. As of Unicode 15.1, Unicode defines a total of 97,680 characters.
In the Unicode standard, a plane is a continuous group of 65,536 (216) code points. There are 17 planes, identified by the numbers 0 to 16, which corresponds with the possible values 00–1016 of the first two positions in six position hexadecimal format (U+hhhhhh). Plane 0 is the Basic Multilingual Plane (BMP), which contains most commonly used characters. The higher planes 1 through 16 are called "supplementary planes". The last code point in Unicode is the last code point in plane 16, U+10FFFF. As of Unicode version 15.1, five of the planes have assigned code points (characters), and seven are named.
CJK Unified Ideographs Extension-A is a Unicode block containing rare Han ideographs.
CJK Symbols and Punctuation is a Unicode block containing symbols and punctuation used for writing the Chinese, Japanese and Korean languages. It also contains one Chinese character.
Kangxi Radicals is a Unicode block. In version 3.0 (1999), this separate Kangxi Radicals block was introduced which encodes the 214 radicals in sequence, at U+2F00–2FD5. These are specific code points intended to represent the radical qua radical, as opposed to the character consisting of the unaugmented radical; thus, U+2F00 represents radical 1 while U+4E00 represents the character yī meaning "one". In addition, the CJK Radicals Supplement block (2E80–2EFF) was introduced, encoding alternative forms taken by Kangxi radicals as they appear within specific characters. For example, ⺁ "CJK RADICAL CLIFF" (U+2E81) is a variant of ⼚ radical 27 (U+2F1A), itself identical in shape to the character consisting of unaugmented radical 27, 厂 "cliff" (U+5382).
A variant form is a different glyph for a character, encoded in Unicode through the mechanism of variation sequences: sequences in Unicode that consist of a base character followed by a variation selector character.
CJK Unified Ideographs is a Unicode block containing the most common CJK ideographs used in modern Chinese, Japanese, Korean and Vietnamese characters. When compared with other blocks containing CJK Unified Ideographs, it is also referred to as the Unified Repertoire and Ordering (URO).
CJK Unified Ideographs Extension C is a Unicode block containing rare and historic CJK ideographs for Chinese, Japanese, Korean, and Vietnamese.
CJK Unified Ideographs Extension D is a Unicode block containing rare and historic CJK ideographs for Chinese, Japanese, Korean, and Vietnamese.
CJK Compatibility Ideographs is a Unicode block created to contain Han characters that were encoded in multiple locations in other established character encodings, in addition to their CJK Unified Ideographs assignments, in order to retain round-trip compatibility between Unicode and those encodings. Such encodings include:
Enclosed Ideographic Supplement is a Unicode block containing forms of characters and words from Chinese, Japanese and Korean enclosed within or stylised as squares, brackets, or circles. It contains three such characters containing one or more kana, and many containing CJK ideographs. Many of its characters were added for compatibility with the Japanese ARIB STD-B24 standard. Six symbols from Chinese folk religion were added in Unicode version 10.
Variation Selectors is the block name of a Unicode code point block containing 16 variation selectors used to specify a glyph variant for a preceding character. They are currently used to specify standardized variation sequences for mathematical symbols, emoji symbols, 'Phags-pa letters, and CJK unified ideographs corresponding to CJK compatibility ideographs. At present only standardized variation sequences with VS1, VS2, VS3, VS15 and VS16 have been defined; VS15 and VS16 are reserved to request that a character should be displayed as text or as an emoji respectively.
CJK Unified Ideographs Extension E is a Unicode block containing rare and historic CJK ideographs for Chinese, Japanese, Korean, and Vietnamese.
CJK Unified Ideographs Extension F is a Unicode block containing rare and historic CJK ideographs for Chinese, Japanese, Korean, and Vietnamese, as well as more than a thousand Sawndip characters for writing the Zhuang language.
Unified Unified Unified Unified Unified Unified Unified Unified Unified Unified Not unified Not unified Not unified Not unified Not unified Not unified Not unified 12 are unified Not unified Not unified Not unified
Han Han Han Han Han Han Han Han Han Han Han Han Common Han, Hangul, Common, Inherited Common Hangul, Katakana, Common Katakana, Common Han Common Hiragana, Common Han
This page is based on this Wikipedia article Text is available under the CC BY-SA 4.0 license; additional terms may apply. Images, videos and audio are available under their respective licenses.
