Human Weapon: This video tutorial teaches you the triangle choke technique.
Called Sankaku-Jime in judo, it's a type of figure-four chokehold which strangles the opponent by encircling the opponent's neck and one arm with the legs in a configuration similar to the shape of a triangle. The technique is a type of lateral vascular restraint that constricts the blood flow from the carotid arteries to the brain.