A very common piece of BDSM equipment that can be found in almost any dungeon. The cross consists of two beams that form the shape of the letter X (also known as a saltire cross or X-frame). The ends of each beam have attachments that a person can be cuffed to from their legs and ankles. Much like the A-frame, the sub can be tied either facing the cross, to allow spanking and whipping, or tied with their back to the cross, leaving their breasts and genitals exposed for teasing.
The name comes from its shape, which is said to be identical to the cross St. Andrew has been martyred on.