Does anybody know what this 'key' might be for? It's about 2 inches long and has three metal pins on the end, equally spaced 120 deg apart, and a plastic one in the middle. It's been in the house as long as I can remember and I don't remember ever knowing what it's for. Family members have suggested it might be to open the little door on the outside of the house for accessing the gas and electricity meters, but it's not for that (the door has a triangular metal bar to fit a key). The other suggestion I've had is that it's for football / cricket boot studs, but googling hasn't found a 3 pin key for either sport's boots.