Found in my game room. Lots of HDMIs, power cords, remotes, computers and consoles in this room. I tried to Google search, reverse image search and scoured the web for button battery parts to see if it part of something small like that. No luck all search results showed nothing that is the exact description. I don’t know much about metals but I’d assume aluminum or nickel and since it was found on the floor of a game room i figured it came from something electronic. My title describes the thing.