The classic legionary "scutum", a convex rectangular shield, also disappeared during the 3rd century. The Roman "scutum" was an oblong shield with an oval shape. Escutcheon is an Old Norman word derived from the Latin word "scutum", meaning a shield. The male has a small scutum on the dorsum of the abdomen. It corresponds to constellations Aquila, Corona Australis, Ophiuchus, Sagittarius, Scutum and Telescopium. The shield ("scutum") covers only the front part of the dorsal body. "Scutati" were heavily armored and carried large Celtic type scutum shield. The word "escudo" derives from the scutum shield. He also carried a "scutum" (a curved rectangular shield) to protect himself. Scutum&colon; Oval, convex, only a little smaller than body. This shield was adapted by Roman legions and referred to by them as a "scutum". This relational co-inherence is often represented as Borromean rings or the Scutum Fidei. Gradually the "scutum" evolved into the rectangular (or sub-rectangular) type of the early Roman Empire. In the latter, they used the "scutum", which was a larger shield. In contrast to the "scutum", these shields were round.