signaling device

Noun
  1. A device used to send signals (synset 104224785)
    is a type of: device - an instrumentality invented for a particular purpose
    subtypes:
    • bell - a hollow device made of metal that makes a ringing sound when struck
    • buzzer - a signaling device that makes a buzzing sound
    • 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

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