Akademik

indicator consisting of a light to indicate whether power is on or a motor is in operation

see pilot light 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.

[1880-85]

pilot lamp or pilot light noun

A small electric light to show when current is on, or for some other purpose

Main Entry: ↑pilot

pilot lamp,

a small electric light on many machines and appliances, often mounted behind red glass, lighting up when the electric or other power is turned on, or burning continuously to show the location of a switch or the like.