Katakana Phonetic Extensions is a Unicode block containing additional small katakana characters for writing the Ainu language, in addition to characters in the Katakana block.
Further small katakana are present in the Small Kana Extension block.
History The following Unicode-related documents record the purpose and process of defining specific characters in the Katakana Phonetic Extensions block:
Version Count L2 ID WG2 ID Document 3.2 U+31F0..31FF 16 N2092 N2257 N2278 N2253 N2328
References