Masakari

The masakari (鉞) is an ancient Japanese and Chinese tool. Specifically, it is a 'broad-axe' used for felling trees. It is famous as the battle-axe used by the Yamabushi, the warrior monks. 'Weaponized' versions include a spike/beak opposite the axe blade. The wooden haft through the means of a socket. The masakari has a weight of 4 kg and is 120 cm long.

SOURCES http://www.dougukan.jp/contents-en/modules/tinyd8/index.php?id=24