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One that announces, especially an electrical signaling device used in hotels or offices to indicate the sources of calls on a switchboard.
an·nun′ci·a·to′ry (-ə-tōr′ē) adj.
1. (General Physics) 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. (Railways) a device giving an audible signal indicating the position of a train
3. (Broadcasting) a less common word for announcer
an•nun•ci•a•tor(əˈnʌn siˌeɪ tər)
1. an announcer.
2. a signaling apparatus, esp. in some doorbell systems, that uses lights or pointers to indicate the source of the signal.