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Z (from the German Zahle for count).
The set of integers is represented by Z.
Whole numbers and integers are identical sets. Both are proper subsets of rational numbers.If Z is the set of all integers, and Z+ the set of all positive integers then Q, the set of all rational numbers, is equivalent to the Cartesian product of Z and Z+.
we represent the letter Z in our sets of numbers. for eg:- Z= 1,7,2,8,3,9,4,5,6
The blackboard bold style Z, used to indicate the set of integers, derives from the German word zahlen, meaning numbers.