I recently bought my 3rd (or 4th) tactical pen, and one self-defense tool that looks like a pen but isn't a writing implement at all. It's the Amend2 Magazines Self-Defense Pen.
The Amend2 Self-Defense Pen is a powerful tool for personal safety in a sleek and discreet package. Crafted from the incredibly durable G10 material, this pen is built to withstand the toughest conditions while offering a reliable means of self-defense. With its ergonomic design and comfortable grip, it feels natural in your hand, allowing you to confidently protect yourself when needed. This self-defense pen seamlessly combines functionality and style. Stay prepared and empowered with the Amend2 Self-Defense Pen by your side. Amend2 Self Defense Pen is designed to blend in like a typical marker. Full-length G10 core provides impact resistance and durability. Minimalist design with no metal components. When you tap your fingertip on it, it's not quite a pin-point, but it's very close in sharpness. And G-10 is tough stuff as most of us already know. It's better than Micarta for pistol grips, and it's legendary toughness is why it's so popular as a material for knife handles. It's strong enough to replace metal in many applications, but the entire pen is non-metallic and won't trigger any alarms. I used a paper towel generously soaked with Goo Gone to rub the logo off mine. Followed by Windex to get the Goo Gone off, and soapy water when I washed the Goo Gone and Windex off my hands. That's my regular routine whenever I use Goo Gone (or Goof Off, which I haven't used in several years). Now it looks exactly like an ordinary, harmless, generic Sharpie, and won't set off any visual alarms either. It's only $10.99 directly from Amend2. but I got mine from Detroit Ammo Co. for just $8.99 in my last haul of goodies.
https://amend2mags.com/self-defense-pen/ https://detroitammoco.com/product/amend2-g10-self-defense-pen For a non-tactical pen you can actually write with, I bought an Olight O'Pen Mini Portable Ballpoint Pen. This is small enough to easily fit in the pocket of a dress shirt without sticking out well above the top of the pocket, with the clip barely hanging on. They're a TINY little 3.66 inches in length and only weigh 0.42 ounce. Talk about a featherweight! They're available in Red and O.D. Green, and sell for $12.99 when they aren't on sale. I only bought mine because I had a $5 off coupon, which was equal to the $5 shipping fee. But it's small enough to stick in a pants pocket and forget it's there. I can't say that about any other ink pen I own. As if being made of Aluminum Alloy wasn't good enough, the spiral grooves cut away bring the weight down to a measly 12 grams. It's 0.39 inch (9.8 mm) in diameter, has black ink, and uses OLIGHT O-Refills, in Blue or Black, 3 for $9.99. It must be a gel ink, because if you don't use it for awhile (weeks), it forms a booger on the tip you need to pull off, then it has fresh ink and works great.
https://www.olightstore.com/open-mini-ballpoint-pen https://www.olightstore.com/new-o-refill