Imperialis

The Imperialis symbol, a winged skull, dates back to the Horus Heresy when it was used by the Loyalist Space Marine Legions as a campaign badge. Now it is used more to symbolise the righteous victory of the Imperium of Man over its many enemies in general. It is often carved into the chest armour plate of a Space Marine's Power Armour, although it also appears on Space Marine banners or finials.The wings of the skull represent the wings of the Aquila, the double-headed eagle that is the official symbol of the Imperium, while the skull is a common motif in Imperial iconography which represents the sacrifice of the Emperor for humanity's salvation. The Imperialis is now also used as a Space Marine Honour Badge awarded following a victory in battle.