Bisentō
A bisentō (眉尖刀, 'brow blade') is a polearm used in feudal Japan. The bisentō has various descriptions, "a double-edged long sword with a thick truncated blade", "a spear-like weapon with a blade at the end that resembles a scimitar", "a polearm resembling a glaive, with a long, heavy haft and a heavy, curved blade".