White led "VGA"

[aocon62]

My motherboard every now and then shows this little white led on the side, and next to the words VGA. I have looked at the manual, and it says nothing about what it means. The rig works fine, just worry's me. Can somebody just explain what it means?
Model: Asus TUF B360-PRO GAMING motherboard.

 

[photonboy]

I suspect it stays CONSTANT to indicate a VGA issue and may come on infrequently just to show the LED is functional.

It's not even clear to me what VGA it would refer to since the top "x16" PCIe slot is nothing special in terms of graphics so that VGA may even refer to the motherboard outputs (for the Intel iGPU if no graphics card) which still brings me back to my first point.