A bipod is an attachment for either a photographical device or a weapon that creates a steady plane for whatever it may be attached. It provides significant stability along two axes of motion (side-to-side, and up-and-down). The concept for a bipod dates back to pre-20th century times, and is still used today by agencies such as NASA.
Bipod comes from the Latin and Greek roots bi and pod, meaning "two" and "foot, or feet" respectively.
On firearms, bipods are commonly used on rifles and machine guns to provide a forward rest and reduce motion. They are also seen on other long-barrelled weapons. Bipods permit operators to easily rest a weapon on objects, like the ground or a wall, reducing their fatigue and increasing accuracy and stability. Bipods can be of fixed or adjustable length. Some can be tilted and also have their tilting point close to the barrel's central axis, allowing the weapon to tilt left and right. Some designs also allow the weapon to be rotated side-to-side. There are three ways for bipods to be folded: away from the shooter, towards the shooter, or into a vertical foregrip.
A weapon mount is a weapon component used to affix an armament for stabilization. Weapon mounts can be broken down into two categories: static mounts and non-static mounts.
A static mount is a non-portable weapon support component used on a self-propelled vehicle.
A gun turret protects the crew or mechanism of a weapon and at the same time lets the weapon be aimed and fired in many directions.
A turret is a rotating weapon platform. This can be mounted on a fortified building or structure such as an anti-naval land battery, or on an armoured fighting vehicle, a naval ship, or a military aircraft.
Turrets may be armed with one or more machine guns, automatic cannons, large-calibre guns, missile launchers, and recently Microwave Weapons/Deterrents and Laser Weapon Systems. It may be manned or remotely controlled, and is often armoured. A small turret, or sub-turret on a larger one, is called a cupola. The term cupola also describes rotating turrets that carry no weapons but instead are sighting devices, as in the case of tank commanders. A finial is an extremely small sub-turret or sub-sub-turret mounted on a cupola turret.