Need help finding a weapon from pathfinder

I can't remember what it was called, all I can remember is that on the description it said that if you have exotic weapon proficiency for it, you also count as having two-weapon fighting feat when wielding it. Anyone know what this weapon is at all? I found in on the d20pfsrd site

There is no exotic weapon that I am aware of that is like that. However, there is one that, although medium sized, counts as a light weapon for the purposes of two-weapon fighting. Perhaps that is what you are thinking of? - Gauss

I think you are speaking of the Sabre, Sawtoothed, found on ''The inner Sea World'' Campaing setting. Description : A sawtoothed sabre may be used as a Martial Weapon (in which case it functions as a longsword), but if you have the feat&nbsp; Exotic Weapon Proficiency &nbsp;(sawtoothed sabre), you treat the weapon as if it were a light weapon for the purpose of&nbsp; two-weapon fighting —the sabre remains classified as a one-handed melee weapon for all other purposes. <a href="http://www.d20pfsrd.com/equipment---final/weapons/weapon-descriptions/sabre-sawtooth" rel="nofollow">http://www.d20pfsrd.com/equipment---final/weapons/weapon-descriptions/sabre-sawtooth</a> PD: I took less than a minute in founding your weapon. You cant be so lazy.

Well, I figured it was a double weapon and all so it hadn't occurred to me that that would be it, so it's not really about being lazy