Integer
From sciforums_encyclopedia
An integer is a whole number with no fractional part. The set of integers is:
{..., -3, -2, -1, 0, 1, 2, 3, ...}
The set {..., -3, -2, -1} is the set of negative integers.
The set {1, 2, 3, ...} is the set of positive integers.
The set {0, 1, 2, 3, ...} is the set of natural numbers.