The Pen is Mightier • 137 ranges or, better yet, pressed directly against the face, throat, or base of the target's skull. Those are firearm penguns. Their smaller, slimmer, and more deadly cousins fire darts or needles, usually filled with toxins of varying use and lethality. These are almost exclusively designed, built, and used by professionals, e.g., intelligence agencies, terrorist assassins, and high-tech, free-lance mercenary killers.