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|Noun||1.||warning signal - an automatic signal (usually a sound) warning of danger|
torpedo - a small explosive device that is placed on a railroad track and fires when a train runs over it; the sound of the explosion warns the engineer of danger ahead
signal, signaling, sign - any nonverbal action or gesture that encodes a message; "signals from the boat suddenly stopped"
air alert - the warning signal that begins a period of preparation for an enemy air attack
burglar alarm - a loud warning signal produced by a burglar alarm; "they could hear the burglar alarm a mile away"
fire alarm - a shout or bell to warn that fire has broken out
horn - a noise made by the driver of an automobile to give warning;
red flag - a flag that serves as a warning signal; "we didn't swim at the beach because the red flag was up"
siren - a warning signal that is a loud wailing sound