上标,也叫上角标,是出现在一列正常字体文字的上边的数字、字母或其他符号,在其他字母或符号的左边或右边。
上标具有多种用途,常用于公式、数学式或化学复合物及同位素。也能用于指示文章中一列註腳。在英文中,有时將序数词的结尾写成上标(如 1st、2nd、3rd代替1st、2nd、3rd)。
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