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.