The term 'joint that may be swiveled' is referring to a HIP joint, which is a type of ball and socket joint found in the human body. It is made up of the head of the femur, which is the thigh bone, and the acetabulum, which is a cup-shaped cavity in the pelvis. This joint allows for a wide range of movement, including flexion, extension, abduction, adduction, and rotation. The HIP joint is held together by ligaments and muscles, and it is surrounded by a capsule filled with synovial fluid, which helps to lubricate the joint and reduce friction.