Turaga Matau's tool and badge of office was the Kau Kau Staff. Its name was not related the Kanohi Kaukau, but instead was a joke suggested by Onewa based on the noise made by Brakas in the trees. The name stuck and was called a kau kau staff ever since.
Turaga Matau's tool was the Kau Kau staff.
Although Matau's aero slicers could cut energy shields, the Kau Kau Staff could not.