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|Noun||1.||signaling device - a device used to send signals|
bell - a hollow device made of metal that makes a ringing sound when struck
buzzer - a signaling device that makes a buzzing sound
device - an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water"
foghorn - a warning device consisting of a horn that generates a loud low tone
whistle - acoustic device that forces air or steam against an edge or into a cavity and so produces a loud shrill sound