This isn't sharp, but it is pointy:
I replaced my aluminum version with the stainless steel one. 3.2 ounces vs 1.3. It has a real heft to it, and I think it could be thrown effectively, in addition to a pressure point/stabbing device.
I'm bored, and thinking about launching it into the ceiling over my desk, but I'd have a hard time explaining .45 caliber holes in the ceiling tiles. Maybe I'll try it in someone else's cubicle.
Now that’s a pen. That certainly bears further study on my part. Thanks for the tip, so to speak.