CJK Compatibility Ideographs
CJK Compatibility Ideographs is a Unicode block created to contain mostly 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. However, it also contains 12 unified ideographs sourced from Japanese character sets from IBM.
| CJK Compatibility Ideographs | |
|---|---|
| Range | U+F900..U+FAFF (512 code points) |
| Plane | BMP |
| Scripts | Han |
| Assigned | 472 code points |
| Unused | 40 reserved code points |
| Source standards | KS X 1001 Big5 IBM 32 JIS X 0213 ARIB STD-B24 KPS 10721-2000 |
| Unicode version history | |
| 1.0.1 (1992) | 302 (+302) |
| 3.2 (2002) | 361 (+59) |
| 4.1 (2005) | 467 (+106) |
| 5.2 (2009) | 470 (+3) |
| 6.1 (2012) | 472 (+2) |
| Unicode documentation | |
| Code chart ∣ Web page | |
| Note: Range was initially part of the Private Use Area in Unicode 1.0.0, and removed from it in Unicode 1.0.1. | |
The block has dozens of ideographic variation sequences registered in the Unicode Ideographic Variation Database (IVD). These sequences specify the desired glyph variant for a given Unicode character.
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