Dictionary of Business Terms: subscript
subscript
number or letter used to identify a particular element in an array. In mathematics, subscripts are written below the line, as in x1, or a23. In most computer languages, however, subscripts are enclosed in parentheses, as in X(l) or A(J).
Dictionary of Computer and Internet Terms: subscript
subscript
a number or other indicator used to identify a particular element in an array. In mathematics, subscripts are written below the main line, as in x1 or ak. In most computer languages, however, subscripts are enclosed by square brackets, as in X[1] or A[K].

