1. an announcer.
  2. a signaling apparatus, generally used in conjunction with a buzzer, that displays a visual indication when energized by electric current.


  1. a device that gives a visual indication as to which of a number of electric circuits has operated, such as an indicator in a hotel showing in which room a bell has been rung
  2. a device giving an audible signal indicating the position of a train
  3. a less common word for announcer

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