Dictionary

(sometimes also used uncountably) A visible indication.

Example: I gave them a thumbs-up sign.

Physical evidence left by an animal.

Example: The hunters found deer sign at the end of the trail.

A clearly visible object, generally flat, bearing a short message in words or pictures.

Example: I missed the sign at the corner so I took the wrong turn.

A wonder; miracle; prodigy.

To make a mark

To make the sign of the cross

To indicate