The set of integers.
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They are bot whole numbers and, if not 0, they form a pair of additive inverses.
The immediate [next] superset is, trivially, the set of natural numbers which consists of the counting numbers and zero. The next significant superset is the set of integers: the counting numbers, their additive inverses (or negatives) and zero.
The set of integers (ℤ) is the set of the positive whole numbers and their additive opposites (the negative whole numbers).
They are a pair of opposite whole numbers. Except in the case of 0 whose additive opposite is itself and which does not have a mulitplicative opposite.
Zero is called the smallest whole number because it is the starting point of the number line. It is less than all positive whole numbers and is considered the lowest value in the set of whole numbers. Additionally, zero is the additive identity, meaning that when added to any number, it does not change the value of that number.