What is the meaning of Clipeus?

A shield worn by soldiers of ancient Greece and Rome.

An ornamental disk of marble in this shape.

Part of the exoskeleton of an insect between the carapace and mandibles.

a type of large round shield, properly: a type of shield that was convex (bowl-shaped), likely at least 0.9 m in diameter, and was gripped at the edge, with a fastening for the forearm in the middle

disk of the sun

vault of the sky

Source: wiktionary.org