Buckler
From Karate, Kungfu, Wrestling, Mixed Fighting Information Source
The Buckler is a small round shield (9 - 18" in diameter) gripped in the hand with either a single handle, or two enarmes. The name buckler is a corruption of the Old French word bocler meaning boss, which refers to the boss or umbo at the center of the shield. It has become a matter of convenience to classify the buckler as a small, agile hand-shield. The definition is a convenient one to use but the reader should be aware that the ancients were not so pedantic about such definitions and used the term indifferently. Used since medieval times, bucklers were round or even square, approx. 8-20" and made of metal, wood, or metal trimmed wood. It was usually held in a fist grip and used to deflect or punch at blows and thrusts. The edge could also be used to strike and block. Some had long metal spikes on the front to attack with, or bars and hooks placed on the front to trap the point of an opponent's rapier.
