[citation needed] While sometimes called an ancient weapon and described as dating from the Song dynasty to Warring States or even earlier, most antique examples and artistic depictions are from the late Qing era or later, suggesting that they are actually a comparatively recent design.
Surviving sharpened examples point to actual use as weapons, but their rarity, and the training necessary to use them, strongly suggest that they were only rarely used as such.
Also known as "tiger hook swords" or qian kun ri yue dao (literally "Heaven and Earth, Sun and Moon sword"[1]), these weapons have a sharp blade similar to the jian, although possibly thicker or sometimes unsharpened, with a prong or hook (similar to a shepherd's crook) near the tip.
These weapons typically feature a much shorter or entirely missing main hook, and instead focus on the various cutting and stabbing blades arranged around the guard.
Because of the various protrusions and the high possibility for accidental hooking or stabbing, they are almost never used in sparring, and are used sparingly in two person routines.