superscript
noun [ U ], adjective uk/ˈsuː.pə.skrɪpt/ us/ˈsuː.pɚ.skrɪpt/
（单词、字母、数字或符号的）上标
(a word, letter, number, or symbol) written or printed just above a word, letter, number, or symbol, usually in a smaller size
References to the notes are given in superscript. 注解的标示都是以上标形式给出的。