Clipeus

In the military of classical antiquity, a clipeus (Latin: [ˈklɪpeʊs̠]; Ancient Greek: ἀσπίς) was a large shield worn by the Greek hoplites and Romans as a piece of defensive armor, which they carried upon the arm, to protect them from the blows of their enemies. It was round in shape and in the middle was a bolt of iron, or of some other metal, with a sharp point. The clipeus was more-or-less identical to the earlier aspis.