Clipeus

Cannot be auctioned, traded, or bazaared, but can be delivered to a character on the same account.
Can be obtained as a random reward from the Gobbie Mystery Box Special Dial and similar sources.

In the military of classical antiquity, a clipeus was a large shield worn by the Greeks and Romans as a piece of defensive armor. It was round in shape and in the middle was a bolt of iron, or of some other metal, with a sharp point.

The term "clypeus" is also used by entomologists to describe a shield-like part of an insect's exoskeleton, located behind the mandibles but anterior to the front edge of the carapace.(Wikipedia)