The Arm Triangle is a submission technique commonly used in Brazilian Jiu-Jitsu and mixed martial arts. It involves trapping an opponent's arm against their neck using your own arm, creating a triangle shape. This position restricts blood flow and can lead to a choke if applied correctly. To execute the Arm Triangle, a practitioner typically starts from the side control position. By moving their body and positioning their head, they can secure the opponent's arm and apply pressure. Proper technique and leverage are essential for effectiveness, making it a valuable skill for grapplers and fighters.