“I found this in a parking lot where the taxis usually park outside of a train station. The small round circle on top is a magnet.”
Answer: "This is a ball mark fixer for golfing. The 2 prongs go into the ground to lift the green where your golf ball made its initial crater. The magnetic coin (yours is missing) is, so you can mark your golf ball on the green, so others can putt without your ball in the way."
I think it might be the 95th time I have seen that picture on this site, and yes, old toothbrush :)
Yeah, how could a sponge be used for RFID?
Yeah, Izi, we've been over this before.