annunciator

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annunciator

[ə′nən·sē·ād·ər]
(engineering)
A signaling apparatus which operates electromagnetically and serves to indicate visually, or visually and audibly, whether a current is flowing, has flowed, or has changed direction of flow in one or more circuits.

annunciator

1. A signaling device, usually electrically operated, that emits an audible signal and/or a visual indication under selected circumstances; for example, it may sound an alarm in the case of fire or unauthorized entry.

annunciator

annunciatorclick for a larger image
Indicator flag in a gyrocompass that alternates between a dot and a cross and does not settle on either when AC (alternating current) supply is on. If the compass drifts, then either the dot or the cross will be visible, and the compass will not annunciate.
References in periodicals archive ?
and remembered, it would seem, as a metonymy for the whole of Descartes's annunciatory experience of the night of 10-11 November 1619 came to him not as part of a methodical sequence of thought, but in a dream-revelation, one that he received (to cite his own words quoted by Baillet) "cum plenus forem Enthousiasmo" in a state of divine exaltation, inspiration, or possession?
Timbres are rewardingly explored: brass in jagged annunciatory fanfares, extremes of woodwind registers opening up chording of vast inference, serene punctuations dividing paragraphs of hectic activity and a big trumpet summons dissolving into a heroic flute skirmish.
from the annunciatory "Lo" across the medial lees to a "Ta" of farewell, the novel is writ small in this ringing invocation.
Nonetheless, Brooks began writing in the late sixties with a new awareness that, if "shrieking into the steady and organized deafness of the white ear was frivolous," there were, in contrast, "things to be said to black brothers and sisters, and these things, annunciatory, curative, inspiriting, were to be said forthwith, without frill and without fear of white presence" ("Flowers" 1).