 These too are often shown in art, although it is noticeable that readers are often not making full use of the protective way of holding the book.The knot used for the handle was a Turk's head knot, so named for similar appearance to the turbans worn by medieval Muslims of the Turkish Empire.Sometimes the girdle book had a hook that fastened to the belt; "a hinge connected the hook to the flap of the binding, allowing maximal movement of the book while it was still attached."