A nine-ring broadsword, also known as a "jiu huan dao" in Chinese, is a type of traditional Chinese weapon characterized by the presence of nine rings or loops along the back of the sword's blade. Each ring is typically made of metal and spaced evenly along the spine of the sword.

The nine-ring broadsword is primarily a decorative weapon rather than a functional one. It is often associated with traditional Chinese martial arts performances, wushu demonstrations, and cultural displays. The rings on the back of the sword serve as ornamental elements, adding visual appeal and making the sword distinctively recognizable.

The purpose of the rings on a nine-ring broadsword is primarily aesthetic. They contribute to the overall appearance and design of the sword, making it visually striking and unique. The rings may have historical or symbolic significance, but their presence on the sword is mainly for decorative purposes rather than functional or practical use in combat.

It's worth noting that while the nine-ring broadsword is a distinct weapon with its own characteristics, the design and ornamentation of the sword can vary across different regions, styles, and individual swordsmiths.