To agree or disagree by a given sign is what?

To agree or disagree by a given sign is known as "nonverbal communication" or "sign language," where individuals use gestures, symbols, or signals to express their agreement or disagreement without spoken Words. This can encompass a variety of forms, including body language, facial expressions, or specific signs in formal sign languages. Such methods allow for effective communication in situations where verbal language may not be feasible or appropriate.