SOMEONE PLEASE HELP... I AM TRYING TO IDENTIFY A BUTTON ON A 2000 LINCOLN NAVIGATOR...?

IF YOU DONT KNOW WHAT I AM TRYING TO ASK AND IF YOU HAVE A 2000 LIN. NAV GO LOOK AT YOUR VEHICLE YOULL SEE THE BUTTON IM QUESTIONING...ANYWAY ITS A P WITH SOME SIGNS NEXT TO IT... I CANT EXPLAIN GOOD . SO I GUESS TO ANSWER YOU WOULD HAVE TO KNOW WHAT IT IS ALREADY OR HAVE A 2000 SO YOU CAN LOOK AT IT THREW YOUR OWN VEHICLE...................THANKS