Dear computer scientists or programmers,
What does a set of sets mean to you?
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as a programer, to me a set is an unordered collection of elements without duplicates. so a set of sets would be a collection of those. in practice i rarely need the "without duplicates" constraint
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This is the way I think of a set. I think I've also seen a functional programming definition where a set is defined by the contains(X): Bool operation
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Can efficiently define all fancy methods like intersection, union, difference, symmetric difference, subset, superset, etc. which docs.python.org/3.8/library/st gives you with contains, a way to create them and iteration over the elements.
Mutable sets also have add / pop methods too.
Python has those nice operator overloads for sets.
Comparison for subset/superset, - for difference and the clever use of bitwise operators. Makes sense to think of | as union, & as intersection and ^ as symmetric difference where integers are defined as sets of indexed bits.