Master Cutlery YC-124BK Tactical Self-Defense Pen - Black
A rugged utility pen, can be used as a "kubaton" striking weapon if needed. The heavily toothed or serrated cap can work as a DNA collector as well as a striking face. The interior of this pen can house small items, matches, toothpicks, a cigarette, or lockpicks, and can be helpful in a pinch.
Discrete, usable everyday, and versatile.