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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C++ standard library likes to be special so it not only has ordered sets/maps (based a comparator, not insertion order) but also multisets/multimaps permitting duplicates:
en.cppreference.com/w/cpp/containe
en.wikipedia.org/wiki/Multiset
Other languages usually only have simple unordered sets.
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C++ definitely has a type when it comes to collections.
std::set, std::multiset, std::unordered_set, std::unordered_multiset, std::map, std::multimap, std::unordered_map, std::unordered_multimap
Rarely need more than unordered_set/unordered_map but it's neat having the rest.