Cyrillic Extended-A is a Unicode block containing Cyrillic combining characters used in Old Church Slavonic texts.
Block
History The following Unicode-related documents record the purpose and process of defining specific characters in the Cyrillic Extended-A block:
Version Count L2 ID WG2 ID Document 5.1 U+2DE0..2DF5 22 N3097 doc) doc) U+2DF6..2DFF 10 N3194 doc)
References