It's like a glaive
but with something like a carving fork on the other end.
The carving fork bit would be straight, about the size of the glaive blade.
I've tred Wikipedia, about allsort of polearm an swors and pointy things. I've tried google, with words like polearm and carving fork and got a lot of hits with World of Warcraft.
Also, please excuse any spelling mistakes. My keyboard's gone wierd.