That sounds like an index to me, and the operation surely indexing. I mean, if one has a hashmap hash = {"foo": 1, "bar": 2} we say hash["foo"] is an ind

That sounds like an index to me, and the operation surely indexing. I mean, if one has a hashmap hash = {"foo": 1, "bar": 2} we say hash["foo"] is an indexing operation, and "foo" is an index. Seems the same to me.