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The Yari has a shorter shaft then the naginata and a blade about 20cm long with two cutting edges, allowing a two way attack (cutting tendons, knees etc).
Also called a Yari is a spear about 3.6m long and seldom used because of its awkward handling. Another spear was made of a long pole with a cruciform at the end made of two cutting blades fixed perpendicular to the handle. The point of the weapon used in training is made of wood protected by a leather ball and two round wooden bars take the place of the blades.
This ancient weapon was used to knock down the enemy by cutting smartly through his legs. By swinging the blades back and forth, one could also cut through the neck, arms, sides, leg joints etc.