Like any of these icons? That's nvidia Shadowplay. Just go into the console and hit the power switch on the left.
On the icon on lower right in the taskbar, right click and go to Open Geforce Nvidia Experience.
Turn it off with the switch, or set up your hotkeys to use it. Very good tool IMO, but if you aren't going to capture etc, then turn it off.
You can also change the corner it's in, turn on fps counter etc.