CJK Unified Ideographs Extension B
Unicode block (U+20000-2A6DF)
CJK Unified Ideographs Extension B is a Unicode block containing rare and historic CJK ideographs for Chinese, Japanese, Korean, and Vietnamese submitted to the Ideographic Research Group between 1998 and 2000, plus seven gongche characters for kunqu added in Unicode 13.0, and two characters for the Macao Supplementary Character Set added in Unicode 14.0.
Variation selector sequences
The block has dozens of variation sequences defined for standardized variants. It also has thousands of ideographic variation sequences registered in the Unicode Ideographic Variation Database (IVD). These sequences specify the desired glyph variant for a given Unicode character.
Development process
SuperCJK
The repertoire of Extension B was developed by the Ideographic Rapporteur Group in successive revisions of a document named "SuperCJK". This lists all characters included at the time in the Unified Repertoire and Ordering, in Extension A and in the draft Extension B, ordered by radical and residual stroke count. Each character was included with up to four glyph bitmaps, and references to character sources including the Kangxi Dictionary, the Hanyu Da Zidian, and various national character set standards.
"UCS2003" glyphs
Extension B 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.
“CJK Unified Ideographs Extension B” enters the record as unicode block (U+20000-2A6DF). Crown Archives preserves that source wording while asking what Unified, Ideographs and Extension can confirm, complicate or overturn.
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“CJK Unified Ideographs Extension B” is worth following because a concise public description often conceals a longer documentary argument. Here, Unified, Ideographs and Extension provides the most credible route into that argument.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 2, 2026. The linked authority identifier is Q545703. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1998 and 2000.
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This entry incorporates text from “CJK Unified Ideographs Extension B” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.