- Types:
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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
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air alert
the warning signal that begins a period of preparation for an enemy air attack
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burglar alarm
a loud warning signal produced by a burglar alarm
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fire alarm
a shout or bell to warn that fire has broken out
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foghorn, fogsignal
a loud low warning signal that can be heard by fogbound ships
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horn
a noise made by the driver of an automobile to give warning;
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red flag
a flag that serves as a warning signal
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siren
a warning signal that is a loud wailing sound
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alarm bell, tocsin
the sound of an alarm (usually a bell)
