A person who announces or proclaims something; a device that indicates or signals an announcement.
From Latin 'annuntiator' (one who announces), derived from 'annuntiare' (to announce) + '-tor' (agent suffix). In modern usage, especially refers to electronic devices that display messages.
In old buildings and hotels, the 'annunciator' was a magical-seeming electrical board with little numbered windows that would light up to show which room needed service—it was early automation!
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