Subscript
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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 example of a subscript is the number 2 in the formula for the molecule of water; H2O.
In HTML, subscript text is produced by putting it inside the tags <sub> and </sub>.
In Unicode, there exist also special subscript characters, such as: ₀₁₂₃₄₅₆₇₈₉₊₋₌₍₎