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CJK Compatibility is a
CJK Compatibility is a Unicode block
A Unicode block is one of several contiguous ranges of numeric character codes (code points) of the Unicode character set that are defined by the Unicode Consortium for administrative and documentation purposes. Typically, proposals such as the ...
containing square symbols (both CJK and Latin alphanumeric) encoded for compatibility with East Asian character sets. In Unicode 1.0, it was divided into two blocks, named CJK Squared Words (U+3300–U+337F) and CJK Squared Abbreviations (U+3380–U+33FF).
The square forms can have different presentations when they are used in horizontal or vertical text.
For example, the characters (from ) and (from ) should look different in horizontal and in vertical right-to-left:
Characters U+337B through U+337E are the Japanese era calendar scheme symbols Heisei
The was the period of Japanese history corresponding to the reign of Emperor Akihito from 8 January 1989 until his abdication on 30 April 2019. The Heisei era started on 8 January 1989, the day after the death of the Emperor Hirohito, when hi ...
(㍻), Shōwa (㍼), Taishō (㍽) and Meiji (㍾) (also available in certain legacy sets, such as the " NEC special characters" extension for JIS X 0208
JIS X 0208 is a 2-byte character set specified as a Japanese Industrial Standards, Japanese Industrial Standard, containing 6879 graphic characters suitable for writing text, place names, personal names, and so forth in the Japanese language. Th ...
, as included in Microsoft's version and later JIS X 0213). The Reiwa era symbol () is in Enclosed CJK Letters and Months (the CJK Compatibility block having been fully allocated by the time of its commencement).
Block
History
The following Unicode-related documents record the purpose and process of defining specific characters in the CJK Compatibility block:See also
*Unicode compatibility characters
In Unicode and the Universal Character Set, UCS, a compatibility character is a character that is encoded solely to maintain Round-trip format conversion, round-trip convertibility with other, often older, standards. As the Unicode Glossary says: ...
*CJK Unified Ideographs
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 Uni ...
*Katakana (Unicode block)
Katakana is a Unicode block containing katakana characters for the Japanese and Ainu languages.
Block
History
The following Unicode-related documents record the purpose and process of defining specific characters in the Katakana block:
See ...
*Letterlike Symbols
Letterlike Symbols is a Unicode block containing 80 characters which are constructed mainly from the glyphs of one or more letters. In addition to this block, Unicode includes full styled mathematical alphabets, although Unicode does not exp ...
References
{{CJK ideographs in Unicode Unicode blocks