Two charges in a single round. Example: in reactive armor, the first charge takes out the reactive armor and the seond, rear, shaped charge penetrates the hull by burning through. A variant of this is used against composite (brass-ceramic mesh) in which the first "charge" is a dumbbell shaped head that shatters the composite, allowing the follow on charge to penetrate the hull. It was this type of round that caused the army to switch to a depleted uranium armor for the m-1.