Jion 慈恩 (“Mercy”) is a representative kata in the Shotokan system because of the importance of the perfection of the basic stances it contains, notably zenkutsu dachi (front stance) and kiba dachi (horse stance). Also practiced in some Shito Ryu organizations, emphasis is also placed on kokutsu dachi, the kata is noticeably shorter than its Shotokan counterpart. (Source: http://en.wikipedia.org/wiki/Jion)