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What is the sign of the Aquilla? Like whats the gesture you always have guardsmen doing in books?

quite simply you cross your thumbs to form the double-eagle's head and your hands the wings across your chest, your right hand's fingertips touching your left collarbone and your left the right bone.
the sign of the omnissiah is akin to the gesture but you do not cross your thumbs and splay out your fingers instead of keeping them together.
visual reference avalible at pg.59 Codex: Necrons.