Hentaigana
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In the Japanese writing system, hentaigana are variant forms of hiragana. Wikipedia
Parent systems: Oracle bone script > Seal script > Clerical script > Regular script (kanji) > Man'yōgana > Hentaigana
Sister systems: Katakana, Hiragana
Unicode range: U+1B000–U+1B0FF Kana Supplement; U+1B100–U+1B12F Kana Extended-A