What is the only movable joint of the skull?

BBC states that the only movable joint on the skull is part of the mandible, or the lower jaw bone. According to the University of Washington School of Medicine, the joint formed around the mandible is known as the temporomandibular joint.

When the temporomandibular joint moves, it forms two movements: a horizontal rotation around the joint's fixture, and an anterior translation that allows the jaw to open fully. The temporomandibular joint is named for the two bones that connect via the joint: the temporal bone, which is attached to the skull, and the mandible, which is the movable lower jaw bone.