The triangle choke is a submission technique commonly used in Brazilian Jiu-Jitsu and mixed martial arts. It involves trapping an opponent's head and one arm between the legs, forming a triangle shape. This position restricts blood flow to the brain, leading to a potential submission if the opponent does not escape. To execute the triangle choke, the practitioner typically starts from the guard position. By using their legs to create the triangle, they can apply pressure by pulling down on the opponent's head while pushing their knee against the trapped arm. Proper technique and positioning are crucial for effectiveness.