Katana
As a rule, katana was worn under the belt on the left side of a right-handed man. The sword was in its sheath or scabbard (the cover), with its blade facing up. That way the sword could be drawn and cut the opponent in one movement. Alternatively, the scabbard might be held freely in the left hand: in action the sword would be drawn and the scabbard thrown down. This allows for free movement in battle.