pilot lamp
noun
1.
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
Examples from the web for
pilot lamp
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.
British Dictionary definitions for
pilot lamp
pilot lamp
noun
1.
a small light in an electric circuit or device that lights up when the circuit is closed or when certain conditions prevail