Dao (Naga sword)

Dao is the sword of the Naga people of Northeastern India, mainly in the Indian states of Assam and Nagaland. The sword, with its wooden hilt, and unique square form is used for digging as well as for killing.
Form.
The dao broadsword can be found in the northeastern region of Assam and Nagaland in India where the Naga people lives. The dao has a thick and heavy form, with length varies between to . The unique design of this long backsword is that instead of a point, the tip of the sword is a bevel, creating an appearance of a squarish shape. This form is also found in the Burmese dha whose form is derived from the dao. The form of the dao was first adopted by the Kachin people. From here the form would evolve to the more elongated dha.
The blade of the Dao is almost straight, with a very minimal curve that can only be discerned upon close examination. The blade is heavy and chisel-edged. It has a unique form that it is narrowest at the hilt and the gradually broaden to the endpoint. 
The wooden hilt has a very simple shape, without a guard or without a distinguished pommel. Bamboo root is considered to be the best material for the hilt. The grip of the handle is sometimes wrapped with basketry. Sometimes the hilt is decorated with a bronze cap at the bottom. The hilt may also be made of ivory, and occasionally can be well-carved. 
Dao is usually carried in an open-sided wooden scabbard which is fastened to a rattan belt hoop. The scabbard is centrally hollowed out on one face.
Multi-function.
The dao is almost the only tool that was used by the Naga people. It is used for many purposes e.g. for building houses, to clear the forest, to dig the earth, to make the women's weaving tools, and to create any kind of wooden objects. The dao is also used as a weapon.