Jujitsu ( ) (sometimes spelled Jujutsu or Jiujitsu) is a martial art of Japanese origin, part of the ancient Samurai tradition. It is a superset of Judo [throws, pins & mat-work], Aikido [avoidance of confrontation through mind-control, leverage, directed-momentum, pressure points & joint locks] and Karate [direct assault through strikes & kicks], all combined into an extremely effective self-defense system. Classical Jujitsu also includes training in non-blade (traditional Okinawan) weapons such as Jutte (and its evolutionary daughter Taiho-Jutsu), Jo- and Bo-Staff, Kubotan, Shuriken, Manriki-Gusari, Psi, Tonfa, etc. It is the oldest Martial Art, evolved and preserved by several Japanese clans over nearly 2,000 years, from which Judo, Aikido, and Karate evolved in only the last two centuries. These all evolved into art-forms where the dangerous aspects of practicing them with partners had been removed. Jujitsu retains numerous powerful and dangerous techniques no longer seen in these arts; for this reason, most Sensei teach it in the framework of a purely self-defense art.