Question

why integer have sign of z​

Answer 1

Answer:

letter "Z"—standing originally for the German word Zahlen ("numbers"). ℤ is a subset of the set of all rational numbers ℚ, which in turn is a subset of the real numbers ℝ. Like the natural numbers, ℤ is countably infinite. The integers form the smallest group and the smallest ring containing the natural numbers

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Answer 2

Answer:

The notation Z for the set of integers comes from the German word Zahlen, which means "numbers". Integers strictly larger than zero are positive integers and integers strictly less than zero are negative integers.

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