I believe these weapons were used by the Shaolin monks. While im not sure of this i do believe
that they would make great exotic weapons and are very unique. The only thing BF makes that is anywhere close to this would be the hand guard for the hook sword which could be used as a bit of a base for the design if Armothe choses to make this weapon. Enough of my yammering,here is a link to a site full of pictures. Please note this thing has a ton of different names. http://deerhornknives.com/knives.html
Also take note I am requesting the small symmetrical blades, not the longer ones.