Look into Tactical Pens. They are..Well, pens, made from 6061 aircraft aluminium, typically equipped with a glass breaker for striking/emergency. Or a sharp circular end known as a 'DNA catcher' due to it's ability to tare. However, they write perfectly fine if you choose to use it that way. You usually have the option on them to switch between two ends. They can't really 100% be quite distinguished as a weapon either, tac pens are things you can carry in your shirt pocket, with a notepad for airports etc. But hell, you hit someone in the sternum with one of those and they are gonna be real hurting. Less lethal option in the EDC, although nothing says you cant use them to a lethal extent..Of course, I'm not a total expert, just that I've been involved in cases where there has been a commotion and someone had a hole in their head cracked like popping your finger through a chocolate Easter Egg, and chucks missing from the torso because they drew a kubaton-like tool during a commotion.