parade rest

noun

: a formal position assumed by a soldier in ranks in which he remains silent and motionless with the left foot 12 inches to the left of the right foot and with the weight resting equally on both feet and when without arms clasps the hands behind the back with the palms to the rear and when with a rifle holds the rifle in the right hand with butt touching the ground and muzzle inclined forward and holds the left hand behind the back

—used as a command to assume this position