Yes! That's the one I remember. +1 for both of you, thanks!
I've been looking for it since it was on my mind before, but
this thread's Exotic Weapon Master notes rang a bell for me and then I derped and forgot why I was looking for it, but knew I'd find why I was looking for it once it was found.
The reason it's notable is because it seems to be the only weapon that is both a double weapon and a reach weapon at the same time. Attacking both adjacent and at reach is also handy plus it can be used for tripping. Alas, it doesn't have the wording that says it functions as a quarterstaff for all purposes.