Glossary /// Alias
Front triangle
Also known as Standard Triangle — the canonical term used on this site.
Training background: five-triangle classification — the reference orientation
The standard triangle, named by orientation
Front triangle is the orientation-based name for the standard triangle — the guard triangle applied facing the opponent, called omote sankaku in the five-triangle classification.
Etymology. In the five-triangle taxonomy (front, rear, side, opposite, reverse), “front” marks the default orientation: attacker facing the opponent, legs locked over the shoulder line from in front. Where other variants are named by their departure from this orientation, the front triangle is the reference configuration the others are measured against.
Mechanics. One arm in, one arm out: the trapped arm is steered across the neck so the opponent’s own shoulder closes the far carotid while the attacker’s shin and hamstring close the near side. Angle beats squeeze — the perpendicular adjustment and the arm across the midline complete the strangle.
Cross-reference. “Sankaku jime” is the judo name. Full mechanical coverage on Standard Triangle.