The Subscript reference article from the English Wikipedia on 24-Apr-2004
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Subscript

A subscript is a number, figure or indicator, that appears below the normal line of type, when used in a formula, mathematical expression or description of a chemical compound. Probably the most famous subscript is the number 2 in the formula for the molecule of water, H2O.

See Also: superscript, font, typesetting, mathematical notation.