The polearm is a heavy bladed weapon mounted on a sturdy shaft. The steel blade often has a point like a spear as well as a heavy cutting edge like an axe. It is held in both hands and used to chop as well as thrust. There are many different kinds of polearms, from halberds and bills, to glaives and pole axes.
Note: in some army books polearms go under the name of "halberd" instead.