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Indexed

Indexed[expr_, i_]

represents the component of expr with index i and formats as expected in traditional form.

Indexed[expr_, {i_, j_, ...}]

For example

Indexed[x, {1,2}]
(*TB[*)Indexed[(*|*)x(*|*), {(*|*)1,2(*|*)}](*|*)(*1:eJxTTMoPSmMAgmIuIOGZl5JakZrilF8BAECTBhI=*)(*]TB*)

If expr represents a List, a corresponding Part of this list will be taken