ETYM Latin subscriptus, p. p. Related to Subscribe.
(Printing) Written or printed below and to one side of another character; SYN. inferior.

A character or symbol set or printed or written beneath or slightly below and to the side of another character; SYN. inferior.
One or more characters printed slightly below the baseline of surrounding text. See also baseline. Compare superscript.

In programming, one or more numbers or variables that identify the location of an element in an array. See also array, index (definition 2).