what is this dot for

[guyxc9]

it comes on usually when i watch whatsApp videos, but not always. it stays on for a few seconds, sometimes less than a second. it goes away if i take a screenshot, or turn wifi off, or exit whatsapp. i'm running os10 on my unrooted samsung galaxy s9 plus.

 

[B. Diddy]

Welcome to Android Central! There's a discussion here about that: https://forums.androidcentral.com/lg-v20/808261-white-dot-top-left-notification-bar.html. I'm not sure if there was a definitive answer, though.