Alias · Triangle system
Figure-four with legs
Also known as Omoplata — the canonical term used on this site.
Training background: colloquial — describes the leg configuration
Informal — the legs' figure-four shoulder lock
Figure-four with legs is a colloquial name for the omoplata — describing the figure-four the legs form around the trapped arm.
Etymology. “Figure-four with legs” names the leg configuration, one leg over the arm and hooked behind the other knee, the same shape a kimura makes with the arms. The label foregrounds that leg lock shape in plain terms.
Mechanics. The leg figure-four loads the shoulder past its natural rotational range: clamping the arm and turning the shoulder forward drives the joint toward its limit faster than the surrounding muscle can resist, the legs supplying the leverage that a figure-four of the arms would in a kimura.
Cross-reference. “Shoulder lock from guard” is a sibling alias. Full mechanical coverage on Omoplata.