The shuangshou jian is a Chinese two-handed double-edged straight sword (jian). Historically, shuangshou jian were up to 1.6 meters (65") in length, and the two-handed grip could be used as a lever to lock the opponent's arm if necessary. Large ring pommels are prevalent in the construction of shuangshou jian.
The original article can be found at Shuangshou jian and the edit history here.