SIGNAL

Definition

1. adjective notably out of the ordinary.
2. verb communicate silently and non-verbally by signals or signs. — synonyms: sign, signalize, signalise
3. verb be a signal for or a symptom of. — synonyms: bespeak, betoken, indicate, point
4. noun any nonverbal action or gesture that encodes a message. — synonyms: signaling, sign
5. noun any incitement to action.
6. noun an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes.