(n)signalan electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes
(v)sign, signal, signalize, signalisecommunicate silently and non-verbally by signals or signs“He signed his disapproval with a dismissive hand gesture”, “The diner signaled the waiters to bring the menu”
(v)bespeak, betoken, indicate, point, signalbe a signal for or a symptom of“These symptoms indicate a serious illness”, “Her behavior points to a severe neurosis”, “The economic indicators signal that the euro is undervalued”