Legal tender . It is a name it takes from the metal piece (usually disc-shaped) minted by a state that credits its exchange value printed on one of its faces, along with other distinctive marks. It has its origin in ancient Rome, by the temple of the goddess Juno Moneta that was next to the site where the denarii were minted, so it also ended up being the protector of economic goods. See chirola .
Small metal disc, with minted on both sides and that has some economic value. Currency, money, cash, exchange, piece, disk. Numismatic piece.