The Containers clause often uses "references, pointers, or iterators" which is verbose, and needs to be said in full whenever talking about iterator invalidation. It would be helpful to have a term of art that refers to all of them, something like "element references" or to avoid any confusion with actual references, "element indicators". Maybe "element handles" but that could be confused with node handles for associative containers, and (based on Wikipedia) has connotations of additional indirection, and something which would not be invalidated when the underlying storage changes.