sabre

The saber features a flat blade, and has a maximum weight of 500 grams. Unlike foil and epee fencing, the fencer is able to score points if he makes hits with any part of his blade. The target area for saber fencing includes the torso above the waist, the head and arms, but exclude the hands and anything below the opponent’s waist. Similar to foil fencing, the right-of-way rule applies. 

Sabre is very mobile, Sabreurs almost never stand still, sometimes they even run back and forwards along the whole length of the piste.  They take big sweeping swings at each other.  It is the only fencing weapon where you can "chop", i.e. score with the edge of the blade.