Definitions for "Annunciator"
One who announces. Specifically: An officer in the church of Constantinople, whose business it was to inform the people of the festivals to be celebrated.
An indicator (as in a hotel) which designates the room where attendance is wanted.
This is a signaling device, either visual or audio based. For example, wireless annunciators use infrared beams that trigger an audible signal when interrupted, and can be used for security or retail purposes.
Keywords:  symbol, driven, word, segment, phrase
A word or special symbol which is driven as a single segment
A word, phrase, or symbol; an active element.