It is used by Kitana as her secondary fighting style in Mortal Kombat: Deadly Alliance and Armageddon as her primary fighting style and by Ashrah as her secondary fighting style in Mortal Kombat: Deception. It is also used by both Kitana and Ashrah in Mortal Kombat: Unchained.
Ba Gua Zhang, translated to Eight Trigram Palm, is a relatively new Chinese martial art, having been developed in the late 1800's. Ba Gua Zhang was developed by Dong Hai-Chuan, a Taoist of the Lung Men (Dragon Gate) Sect. The circular movements of the art are attributed to the circular chanting meditations done by the Lung Men Sect. Starting in the early 1900's, Ba Gua Zhang has been associated with Hsing-I.