sign

noun

• (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.