👉 In physics, a bridgehead is an object that has two or more faces that are connected by a joint (a pin) which allows for movement between these faces. It is often used in the context of mechanical systems to represent a rigid body with multiple joints and links. For example, consider a bridgehead in a machine where the head and tail of the bridgehead are linked together. This structure can be useful in various applications such as robotics, where it's commonly used in manipulators or in