The [[Imperium of Man ]] as a whole uses a traditional hand gesture to pledge the inhabitant's allegiance. While there is some debate to how the gesture is made there are generally two themes of idea:

The 'Chest' function of the '''Sign of Aquila ''' has it's its user place their hands flat on their chest with their thumbs interlocked. This makes the image of a bird the [[Imperial Eagle]] on the chest with the thumbs forming the head and the straight fingers symbolizing the wings.

 In Catholicism, many catholics Catholics cross themselves to draw an imaginary cross over their bodies. Borrowing from that idea it is proposed members of the Imperium of Man simply touch their forehead for the head of a bird, shoulders for the wings, and chest for the body. While this idea is not as widely accepted as the 'Chest' method, many agree it adds realism and depth to the mysterious gesture.