From Joanna Stern, regarding the new Google Pixel phone lineup feature:

Google calls it the HiLight, a customizable LED ring around the camera flash on the Pro models that lights up differently depending on who is trying to get your attention. Mom calls? Red. Your boss? Blue. Your boss’s mom? Purple.

I was just thinking about this the other day, I had it on my original Motorola Droid phones and loved it. I guess, even though it had standardized on Android phones for a while, catching up to the iPhone meant everyone dropped it. Happy to see it return.