There are two main reasons:
'z' is used to denote integers in german. 'z' denotes zahlen
It comes from the German word zahlen.
Because Zahlen is German for "numbers."
Set of integers is denoted by Z, because it represents the German word Zahlen which means integers
It's short for Zahlen, which is German for "numbers". Why German? Why not?
The symbol for the set of integers is Z and it comes from the German word Zahlen, meaning numbers.
The blackboard bold style Z, used to indicate the set of integers, derives from the German word zahlen, meaning numbers.
The symbol for the set is Z, from the German Zahlen meaning numbers.
The letters stand for the German Quotient and Zahlen.
The set of integers consists of zero, the natural numbers and their additive inverses. This is often denoted by a boldface Z ("Z") standing for the German word Zahlen, "numbers".
The symbol is Z from the German word for integers, zahl.
Z is the symbol for integer. It is the initial letter of Zahlen, the German word meaning "number"