Furigana:
Furigana (振り仮名) is a Japanese reading aid, consisting of smaller kana, or syllabic characters, printed next to a kanji (ideographic character) or other character to indicate its pronunciation.
en.wikipedia.org
振假名:
振假名（jpn）亦有注音假名之稱，指日語中主要為表示日文漢字讀音而在其上方或周圍附註的假名表音符號。
zh.wikipedia.org
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Furigana振假名