A null set.
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It's called an infinite set.
null set or empty set, is a set with no elements.
If you mean null set, that's a set having no elements, or only zeros as elements.
I believe you are talking about subsets. The empty set (set with no elements) is a subset of any set, including of the empty set. ("If an object is an element of set A, then it is also an element of set B." Since no element is an element of set A, the statement is vacuously true.)
It depends on what the elements are.