腕挫三角固 Ude-hishigi-sankaku-gatame (triangular armlock) SGT

A lock. From your opponent’s front, rear, or side, wrap your right leg over his shoulder and across his neck, and your left leg under his right armpit, hooking one of your feet under the other leg in a triangular formation. At the same time, use one or both hands to extend and control his elbow joint.