Sankaku yari (三角槍, triangle spear) have a point that resembles a narrow spike with a triangular cross-section. A sankaku yari therefore had no cutting edge, only a sharp point at the end. The sankaku yari was therefore best suited for penetrating armor, even armor made of metal, which a standard yari was not as suited to. There are two types of sankaku yari, sei sankaku yari are yari blades that have a triangular cross section with three equal sides as in an equilateral triangle, and hira sankaku yari which have a triangular cross section with two equal sides like an isosceles triangle.
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