Subscript adj. Written below or underneath; as, iota subscript. (See under Iota.) Specifically (Math.), said of marks, figures, or letters (suffixes), written below and usually to the right of other letters to distinguish them; as, a, n, 2, in the symbols Xa, An, Y2. See Suffix, n., 2, and Subindex.
... Greek letter theta is represented by THETA. In chemical and mathematical notations, a subscript is enclosed in braces and preceded by an ... — American Rural Highways • T. R. Agg
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