An "indicator light" is a small light on a device that shows a specific information or status. It helps you understand if something is on, off, working correctly, or needs attention without having to check it in detail. Full definition
New LED indicator lights on the console make the current gear setting and selection clear and simple. (hondanews.com)
This battery case clearly displays power status with LED indicator lights. (indabaa.com)
A charging indicator light in the top right corner of the tablet will help prevent you from getting carried away and running out of power in the middle of an important task. (lifewire.com)