316 PTO question

On My dash the switch for the mower PTO is marked with 2 symbols and at the other position there is 1 symbol. I can't figure out the bottom symbol with the switch in the down position. I looked up under the back to see if there is a spline for a PTO shaft and on the hydro and there is one. This machine is new to me so I'm trying to learn what is what on it and what implements i can buy for it. So the question is what the 1 symbol on the dash goes to in the down position.