integer -
An element of the infinite and numerable set {... ,-3,-2,-1,0,1,2,3,.. ..
Wikipedia
The integers are formed by the natural numbers including 0 together with the negatives of the non-zero natural numbers (−1, −2, −3, ...). Viewed as a subset of the real numbers, they are numbers that can be written without a fractional or decimal component, and fall within the set {... −2, −1, 0, 1, 2, ...}.