Symbol representing this block in the Unidings font

CJK Unified Ideographs Extension C

Block from U+2A700 to U+2B73F. This block was introduced in Unicode version 5.2 (2009). It contains 4149 codepoints.

The Wikipedia provides the following information on block CJK Unified Ideographs Extension C:

CJK Unified Ideographs Extension C is a Unicode block containing rare and historic CJK ideographs for Chinese, Japanese, Korean, and Vietnamese.

Chart at Unicode.org (PDF)
Block at Decode Unicode