If you had 2^3 or 9^10 in maths, the 3 and 10 (what the number is to the power of) are known as indices.
Or in programming?
Indices could be a plural of index, and an index could be, for example, a point in an array you're trying to access. For example, in my_array[4], 4 is the index of the array being accessed.
Exponents indeed. Although I was trying to avoid the word under the circumstances. I figured if some was unfamiliar with the term 'indices' then they may be equally as unfamiliar with 'exponents'.