sign
noun
°A visible indication.
"Their angry expressions were a clear sign they didn't want to talk."
°A clearly visible object, generally flat, bearing a short message in words or pictures.
"The sign in the window said "for rent"."
verb
°To write one's signature on (a document), thus showing authorship.
"I forgot to sign that letter to my aunt."
°To give legal consent by writing one's signature.
"I'm not signing anything without my lawyer present."