The Low St Andrews cross is a BDSM bondage device that typically consists of two horizontal bars, one low to the ground and the other at waist height. There are several synonyms for this type of BDSM cross, including the X-cross, the St Andrews cross, the Crux decussata, and the saltire. The X-cross is named for its shape, resembling the letter "X," while the St Andrews cross is named for the Scottish flag that shares a similar design. The Crux decussata and saltire are both Latin phrases that mean "crossed diagonally," referring to the crossing of the two horizontal bars. Whatever the specific name, the Low St Andrews cross remains a popular bondage device among BDSM enthusiasts.