i need help figurein out what this button on my 95 does its between the fan speed and temp knobs, and he icon looks like a hexagon, and it has on pushes with a green back light

maybe the glass defroster for back window? Mines a 97 only thing i have up there is hazards on the top then under that is the back window defroster for those metal strips and then an empty spot to put something and the the contols for ac/heat start. My defrost button also lights up like yours