Shielded Twisted Quad (STQ) is the shielded version of the Twisted Quad(TQ). This is the star quad.
The structure of the shielded twisted quad is the same as that of the star quad. The four cores are twisted together in a cross shape. Two opposite cores each form a connecting pair. In the shielded twisted quad, this arrangement is covered by a shield, or braided shield, or a double shield consisting of an inner and outer shield.