The butterfly sword is a very short dao with length of about that of a human forearm. Its blade is designed in such away that it makes an extremely effective stabbing and slashing weapon. It can be quickly and easily flipped from a icepick grip to a hammer grip. Any knife grip works on it and can be used. It is well regarded as the most versatile of Chinese weapons. It has a strong balance of offensive and defensive capabilities; and it can be used in just about any way.