Seisan Seisan The karate kata (alternate names Sesan, Seishan, Jusan, Hangetsu) literally means '13'. Some people refer to the kata as '13 Hands', '13 Fists', '13 Techniques', '13 Steps' or even '13 killing positions'. However, these names have no historical basis. Seisan is thought to be one of the oldest kata, being quite spread among other Nahate schools. Shito-ryu has its own version and different versions are now practised even in Shuri-te derivatives like Shotokan (called Hangetsu) and in Wado-ryu (called Seishan). Isshin-ryū also adopted this kata. This kata is also practiced in Korean styles such as Tang Soo Do and
Paul K. Ryu of the judiciary. Ryu graduated from the University of Tokyo in 1943 and received his P.h.D. from Yale Law School in 1958. On January 3, 1959 Ryu married Helen Silving at the home of New York University’s chancellor, George D. Stoddard. Silving and Ryu met while at Harvard University. Paul K. Ryu Paul K. Ryu (also known as Ryu Kichyun and Ki-chʻŏn Yu) was the ninth president of Seoul National University and the sixth dean of Seoul National University School of Law. Prior to his appointment as Seoul National University president, Ryu was Dean of the Office of Academic Affairs.