CJK(20,902),
Extension A and Extension B
The CJK Unified
Ideographs range was introduced with version 2.0 of the Unicode
Standard and ISO/IEC 10646-1:1993. It contains 20,902 Han characters.
The CJK Unified Ideographs Extension A range was introduced with
version 3.0 of the Unicode Standard and ISO/IEC 10646-1:2000. It
provides additions 6,582 Han characters to the CJK Unified Ideographs
range.
The CJK Unified Ideographs Extension B range was introduced with
version 3.1 of the Unicode Standard, and provides 42,711 additions
to the CJK Unified Ideographs range. The CJK Unified Ideographs
Extension B range is located in Plane 2 (the supplementary Ideographic
Plane), which requires the enabling of surrogates in Windows 2000;
these characters cannot be displayed in earlier versions of Windows.
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