The Kuwa is an Okinawan and Japanese weapon shaped like a gardening tool of the same name. The gardening tool kuwa is shaped like an adze and used similarly to a hoe. The weapon kuwa is used in Okinawan kobudō.
External links http://www.okinawanweapons.com/kuwa.html http://www.ikigaiway.com/2009/kuwa-okinawan-hoe-and-tool-of-self-defense/
ja:鍬#武術