The list has been posted, with thanks to
@Mestemia .
Your question is one of "definitions," and definitions belong to humans. We have a number of ways of doing that. I could define, for example, the set of all even numbers (any number that is divisible by 2 {2,4,6...} or any "prime number" (divisible by itself and 1 only {1,2,3,5,7,11,13,17,...}).
But sometimes forming a precise verbal definition isn't possible without actually providing the set itself, in its entirety. For example, the set of women Bob has ogled ({Amy, Anne, Bertha, Betty, Charlene...}. This is such an example: the set of all guns that the government of Canada wishes to deny Canadians private ownership. Now, since this set is in a law respecting Canada, and it is enacted by a government elected by Canadians, and since the majority of Canadians support the law, the government has the right to do it. Simple.