any document testifying to the identity of the bearer, especially a card or badge. [capitalized]
I'd
A contraction from I would or I had; as, I'd go if I could.
Id
n.
A small fresh-water cyprinoid fish (Leuciscus idus or Idus idus) of Europe. A domesticated variety, colored like the goldfish, is called orfe in Germany. (Zool.)
id
n.
That part of a person's psyche which is the unconscious source of impulses seeking gratification or pleasure; the impulses are usually modified by the ego and superego before being acted upon. (Psychoanalysis)