annunciator

Definitions

General Science

  • noun a device which gives off a sound or light as a warning or to indicate if something is active

Aviation

  • noun a device which gives off a sound or light to indicate which of several electrical circuits is active

Computing

  • noun a signal which can be heard or seen in order to attract attention

Construction

  • An electrical signaling device that identifies when a circuit is engaged.

Electronics

  • An electrical device which utilizes sounds and/or lights to signal an event or circumstance. For example, a blinking light indicating an incoming call.
http://www.dictionarycentral.com/definition/annunciator.html