noun
indicator light; signal light
A light used on a device or control panel to show status, such as power on, operation, or warning.
電源が入ると、表示灯が緑色に点灯します。
When the power is turned on, the indicator light illuminates green.
エラーが発生した場合、表示灯が赤く点滅します。
If an error occurs, the indicator light flashes red.