No-dachi

It looks very elegant and brilliant. They taught us how to wield long swords. But Nodachi is so long. Nodachi weighs about 3kg in the blade about 165cm.

野太刀(No-dachi) is also known as alias 斬馬刀(Zan-ba-toh).
Kanji(Chinese) character have its own meaning. 

野(no) means out field.
太刀(tachi or dachi) means long sword. 

斬(zan) means cut.
馬(ba) means horse.
刀(toh) means sword. 

Samurais were usually using Nodachi at cavalry battle before the Warring States period(16th century).