A triangle choke, or sankaku-jime in judo, is a type of Choke hold that encircles the other person's neck and one arm using your legs. This resembles the shape of a triangle. When pressure is applied using the legs and the other persons shoulder, the blood flow from the carotid artery to the brain is constricted, resulting in a loss of consciousness. On average, it will take 9.5 seconds for the other person to lose consciousness when the choke is applied.[1] This choke is also commonly used in jujutsu and Brazilian jiu-jitsu.
The triangle choke is usually applied from the guard position, where you are controlling the opponent with your legs. However, the choke can also be applied from different mounting positions.