sign

(sometimes also used uncountably) A visible indication.

“I gave them a thumbs-up sign.”

Physical evidence left by an animal.

“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.

“I missed the sign at the corner so I took the wrong turn.”

A wonder; miracle; prodigy.

An astrological sign.

“Your sign is Taurus? That's no surprise.”

Positive or negative polarity, as denoted by the + or - sign.

“I got the magnitude right, but the sign was wrong.”

A specific gesture or motion used to communicate by those with speaking or hearing difficulties; now specifically, a linguistic unit in sign language equivalent to word in spoken languages.

Sign language in general.

“Sorry, I don't know sign very well.”

An omen.

“"It's a sign of the end of the world," the doom prophet said.”

A property of the body that indicates a disease and, unlike a symptom, is unlikely to be noticed by the patient.

A military emblem carried on a banner or standard.

To make a mark

To make the sign of the cross

To indicate