Pilot light

n.

1.

a small gas flame kept burning continuously on a stove, water heater, or other gas-burning device, so as to allow immediate ignition of the main flame when the gas flow is turned on.

Noun	1.	pilot light - small auxiliary gas burner that provides a flame to ignite a larger gas burner Synonyms: pilot burner, pilot
	2.	pilot light - indicator consisting of a light to indicate whether power is on or a motor is in operation Synonyms: indicator lamp, pilot lamp

indicator, indicator lamp, pilot lamp