In addition, the CJK Radicals Supplement block (2E80–2EFF) was introduced, encoding alternative (often positional) forms taken by Kangxi radicals as they appear within specific characters.
The Unicode standard encoded 20,992 characters in version 1.0.1 (1992) in the CJK Unified Ideographs block (U+4E00–9FFF).
Within each "Extension", characters are also ordered by Kangxi radical and additional strokes.
The Unicode Consortium maintains the "Unihan Database", with a Radical-Stroke-Index.
The Unicode Common Locale Data Repository provides no official collation (sort order) rule for Unicode CJK characters (short of sorting characters by code point);[3] such collation rules as there are language-specific (such as JIS X 0208 for Japanese kanji) and do not include any of the CJK Unified Ideographs Extension characters.