sign

A visible notice, symbol, or object conveying information or a warning.

"The road sign warned of a sharp bend."

An indication or gesture suggesting the presence or existence of something.

"There was no sign of life in the old house."

To communicate information or instructions using gestures or body language.

"She signed for him to come closer."

To write one's name on a document to authorise or agree.

"Please sign here to confirm your delivery."