Instinct controls menu screen symbol

On the controls menu screen at about the 7:00 o'clock position there is a symbol that that is a narrow rectangle about 1/4 inch

long that projects towards the center of the screen. It does not rotate with the menu symbols when rotating thru the options. It does not show

on any other screen that I have found so far. Can anybody advise me as to what it's for, or does?