subscriptnoun [ C or U ]
/ˈsʌb.skrɪpt//ˈsʌb.skrɪpt/a word, letter, number, or symbol written or printed just below another word, letter, number, or symbol, usually in a smaller size:
Format the figure one in superscript and the figure three in subscript.
The subscripts s and m denote respectively quantities downstream and upstream of the shock.
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superscript