High Explosive (HE) round: an artillery or mortar projectile containing explosive filler designed to inflict damage through blast and fragmentation effects.

Operated, moved, or controlled by fluid pressure, typically oil, used in mechanisms like recoil systems to absorb and manage energy.

Artillery system with integrated propulsion, enabling movement under its own power rather than being towed.

A breech mechanism in artillery where a solid block slides horizontally to open and close the breech for loading.