The denarius was the Roman standard silver coin. Most denarii were minted in Rome itself but there some mints also existed outside of the capital. To be able to trace the coins back to their mints, they were stamped with mint marks. The symbols were various and simple: a crescent, an oar, a star, an anchor. Some coins show instead of symbols letters, monograms or even names that designate a certain mint. Today, however, the signification of most of these symbols is unknown.
This denarius bears on its obverse a staff – or, perhaps, a scepter – which (maybe) stands for the mint of Rome. Apart from that it shows the usual images for denarii, a goddess and the Dioscuri.