A toothed bar, also known as a RATCHET, is a mechanical device that is used to hold an object in place or to move it in a specific direction. The term 'toothed bar' is derived from the fact that it has teeth along its length which are used to grip and move the object. The term 'RATCHET' is derived from the French word 'rachette, ' which means 'to move in a jerky manner.' The RATCHET is composed of a wheel with teeth that can be moved in one direction only, allowing for precise control of the object being moved.