In 1870, Gray developed a needle annunciator for hotels and another for elevators.
From the en.wikipedia.org
The annunciator will also include lamps and audible warning devices to indicate failures of alarm circuits.
From the en.wikipedia.org
The annunciator panel of a Cessna 441 aircraft.
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In industrial process control, an annunciator panel is a system to alert operators of alarm conditions in the plant.
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In large buildings, a central fire alarm annunciator panel is located where it is accessible to fire-fighting crews.
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In the aircraft industry, annunciator panels are groupings of annunciator lights that indicate status of the aircraft's subsystems.
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The annunciator panel will indicate the zone and approximate physical location of the source of a fire alarm in the building.
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Annunciator panels were relatively costly to install in a plant because they had dedicated wiring to the alarm initiating devices in the process plant.
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Electrical Designer with at least 10 years experience doing design modifications and replacing annunciator panels in a Power Plant environment needed near Miami, FL.
From the jobview.monster.com
More examples
An indicator that announces which electrical circuit has been active (as on a telephone switchboard)
An annunciator panel is a group of lights used as a central indicator of status of equipment or systems in an aircraft, industrial process, building or other installation. ...
A word or special symbol which is driven as a single segment
An annunciator is an accessory device used to give remote indication of the status of an operating component in a system. Annunciators are typically used in applications where the equipment monitored is not located in a portion of the facility that is normally attended. ...
A device (such as a light or horn) that indicates an event has occurred.
A visual signaling device indicating one or more conditions that exist or have existed in an associated circuit and which usually requires personal attention.
An active element, such as a symbol, word, or phrase.
A door chime; users can program the annunciator to chime, ring, or announce who or what is waiting at the door.
Any one of warning, caution, or advisory; SYNONYMS: alert;