Wikipedia
Bisento
A was a pole weapon 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 half and a heavy, curved blade". The bisentō is said to have been used by ninja and peasants.