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A subscript or superscript is a number, figure, symbol, or indicator that is smaller than the normal line of type and is set slightly below or above it.
Mathematicians will define the use of subscripts, often... but they are pretty generic, too. Its mathematical use isnt dependent on the authors definition... just the specifics of what it represents, conceptually, in the problem at hand. If you are talking about numbers below numbers, though, it does mean something.