Thirteen hands. The basic form of this kata contains 8 defensive and 5 attacking techniques. Thirteen is also a number representing good luck and prosperity in chinese numerology. Sesan is thought to be one of the oldest kata.
The name "Sesan" is derived from the Chinese characters for "13," which refers to the 13 techniques that are featured in the kata. Sesan is known for its powerful, explosive techniques and strong, stable stances. It is typically taught to intermediate or advanced students who have already mastered the basics of Goju-ryu karate and are ready to move on to more advanced training.