Finite is limited in extent or scope. In mathematics, a finite set is such that the number of elements it contains can be described by a natural number. For instance, the set of integers between -18 and 5 is finite, because it has a natural number (22) of elements. The set of all prime numbers, on the other hand, is not finite. In physics, "finite" is used to mean both "not infinite" and "non-zero."