CJK Compatibility is a Unicode block 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 (㍻), Shōwa (㍼), Taishō (㍽) and Meiji (㍾) (also available in certain legacy sets, such as the "NEC special characters" extension for JIS X 0208, 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:
Version Count L2 ID WG2 ID Document 1.0.0 U+3300..3357, 337B..33DD 187 (to be determined) N2956 doc) 1.1 U+3358..3376, 33E0..33FE 62 (to be determined) 4.0 U+3377..337A, 33DE..33DF, 33FF 7 N2056 N2182 doc) N2167 N2244 N2282 N2374R N2390 N2392 N2407
See also Unicode compatibility characters CJK Unified Ideographs Katakana (Unicode block) Letterlike Symbols
References