I don't have Sandstorm, but I have seen a weapon like the one in the lower right corner IRL. It is a thrown weapon. It is designed that whichever way it hits, there is a blade there to pierce. When throwing a conventional knife/axe, you have to learn to judge your distance from the target, so you can know whether to throw the knife by graping the hilt or the blade, so as the pointy end ends up at the target at the right time. (or the blunt end if you want to knock someone out) (yes, you can do this).