Changdao -

"The changdao was a two-handed, single-edged Chinese sword. The term changdao has been translated as "long saber," "saber-staff," or "long-handled saber." During the Ming dynasty, changdao was often used as a general term for two handed swords. After Republican Era, the term miaodao is sometimes used to describe changdao due to similarity. Tang dynasty sources describe the changdao as being identical to the modao, but the modao may have been a double-edged weapon like earlier zhanmajian. - Wikipedia"