When it is not included in the natural numbers, it is referred to as 'the natural numbers with zero'.
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all the whole numbers including zero(0) are called natural numbers. 0 is the smallest natural number and the greatest number is unknown because natural numbers are endless .
Whole numbers are the set of natural or counting numbers inclding zero
even, whole, non-negative numbers. (zero is not a natural number)
Numbers that are greater than zero are positive numbers.
Zero is a member of the set of whole numbers. Some people include it in the set of natural numbers, some people don't.