Do we have this one?
Dual wielding characters use a weapon in each hand, which is cool. Do you know what's even cooler? Using a single weapon with two edges.
It could be a stick with swords on both edges, or maybe a double-edged sword.
And, since you can put a double edged weapon in one hand, it is possible to have TWO double edged weapons at the same time!
-Illidan stormrage in Warcraft
uses two double edged weapons.
-The champions of nurgle in Warhammer
have a stick with a sword on one end and a flail on the other.