Hangul Jamo Extended-A is a Unicode block containing choseong (initial consonant) forms of archaic Hangul consonant clusters. They can be used to dynamically compose syllables that are not available as precomposed Hangul syllables in Unicode; specifically, syllables that are not used in standard modern Korean.
Block
History The following Unicode-related documents record the purpose and process of defining specific characters in the Hangul Jamo Extended-A block:
Version Count L2 ID WG2 ID Document 5.2 U+A960..A97C 29 N3168R N3168 doc) N3242 N3257 doc) doc)
References