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There's a mathematical concept called a group, which is like a set, only with an additional "group operation" that takes elements of the group as input and produces another element of the group.
When there are two such operations defined, the object is called a ring, which is not meant in the sense of circular but rather in the sense you only otherwise ever see it in "crime ring", as a synonym of group.
This amuses me enough to feel it worth sharing!
