It's short for Zahlen, which is German for "numbers". Why German? Why not?
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'W' but if u want integers which are different then it is 'Z'
'z' is used to denote integers in german. 'z' denotes zahlen
They can be represented as a fraction of two integers.
An irrational number is a number that can't be exactly represented as the ratio of two integers.
The defining characteristic is that they can be represented in the form of a ratio, p/q, of two integers, where q > 0.