This tag is used for Japanese spears after the mid-Kamakura period. For 槍 used as a more broad term, see spear. Ancient Japanese spear-like polearms called 矛, 鉾 (hoko) or 鉾槍 (hoko yari) are simply tagged as spear.
A yari is a long straight-bladed spear commonly used by samurai and other warriors in Japan.