Combining Half Marks is a Unicode block containing diacritical combining characters for spanning multiple characters.
Block
History The following Unicode-related documents record the purpose and process of defining specific characters in the Combining Half Marks block:
Version Count L2 ID WG2 ID Document 1.1 U+FE20..FE23 4 (to be determined) 5.1 U+FE24..FE26 3 N3222R doc) 7.0 U+FE27..FE2D 7 N3571 N3915 doc) N4078 N4131 N4103 N4243 doc) 8.0 U+FE2E..FE2F 2 N4475 doc)
See also Combining character Cyrillic script in Unicode
References