A pivot door hinge is a type of hinge that is used for opening and closing doors. The word "pivot" is derived from the Dutch word "taatsdeur," which means a door with two sides. Pivot door hinges are specially designed to attach doors that can be opened on both sides, such as interior or exterior doors. They consist of two parts: a fixed attachment to the frame and a movable part to the door. Pivot door hinges are made of steel or heavy cast iron and are designed to be strong and durable. They are usually quite large and are mounted in a way that ensures a secure, stable connection between the door and the frame. Pivot door hinges are often used on heavy doors due to their strength and durability.