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 ?
Almost a decade after the annunciatory experience of his dreams, Descartes returned to this use of doubt in a more rigorous manner: in part 3 of the Discourse he dates to the years 1628-29 his formulation of the arguments that led him through a systematic doubt of everything that could be doubted to the Archimedean point of "I think, therefore I am," and from thence to a reconstruction of philosophy.
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).
A close look at the multiple meanings in each scene reveals that Bresson's scriptural allusions (redeeming sacrifice, annunciatory angel, minister of mercy) enrich the film's overall liberating message while maintaining a firm hold on history, physical reality, and the things of this world.