The signum is a military insignia of the Roman army, a form of labarum or standard used by the legions with distinctive elements that represented them, entrusted to the care of a soldier who carried it: the signifer.
The signum is composed of a pole from which a red banner hung, the legion standard. A bronze depiction of a symbolic animal was placed on the tip of the pole, usually an eagle or other predator, which represented the emblem of the company. The signum contained the honours of valour, acquired in combat, and the clipeus, framed metal round shields depicting effigies of the emperor or the Dux.
