An empty set is called a null set. Testing whether a set (or a list, stack, queue) is empty or NULL is an essential concept in both number theory and computer science.
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If you mean null set, that's a set having no elements, or only zeros as elements.
They are the members of the set. It is not possible to list them without knowing what the set is.
Those are called the elements of the set.
The objects within a number set can be caled as "Elements" or "members".
A null set is a set that does not contain any elements, an empty set.