pilot lamp

noun
an electric lamp, used in association with a control, which by means of position or color indicates the functioning of the control; an indicator light or a control light.
Also called pilot light.


Origin:
1880–85

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pilot lamp
 
n
a small light in an electric circuit or device that lights up when the circuit is closed or when certain conditions prevail

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
There must be a red pilot lamp which must go on when the respective amber or red systems are activated.
Status indication shall be provided for all smoke control equipment, annunciated by fan and zone, by pilot lamp type indicators.
There must be a pilot lamp which goes on when the respective amber or red system is activated.
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