Unsu (雲手), literally “cloud hands”, is the most advanced kata found in the Shotokan, Shito-Ryu and karate styles and is generally taught to karateka at the 3rd to 4th Dan. It contains many intricate hand techniques, such as the ippon-nukite (one finger strike) in the opening sequence. Unsu also contains a 360-degree spinning double-kick with a double-leg take down at the same time, landing on the floor face-down before continuing.
Unsu was created by Seisho Arakaki sometime around 1860-1870. Arakaki was a Japanese and Chinese language interpreter to the Shuri court, and a master of monk fist and white crane styles. It is somewhat a condensation of other katas (e.g., Bassai, Kanku, Jion, Empi, Jitte and Gankaku), hence it is essential to have mastered these before practicing Unsu.