It is Z, except that the font used is not one of the standard ones.
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The set of integers is represented by Z.
The symbol for the set of integers is Z and it comes from the German word Zahlen, meaning numbers.
ℤ is the symbol for the set of all integers, that is {..., -2, -1, 0, 1, 2, ...}.
Concentric circles. The set of whole numbers is a subset of the set of integers and both of them are subsets of the set of rational numbers.
Concentric circles. The set of whole numbers is a subset of the set of integers and both of them are subsets of the set of rational numbers.