A person (or group of persons) who believe in nonviolence, but having determined not to be victims, armed and trained themselves. Hoping to never use such knowledge or armament, but understanding in a less-than-perfect world, such preparedness has its place.
Armed Pacifism - one of the few things the Christian Bible, Mahatma Gandhi, the Dalai Lama, Jackie Chan and Malcolm Reynolds all agree on. Not to mention that it is backed up by crime statistics and expert witnesses!
A good article about Armed Pacifism can be found here by Peter Heft.
"If you don't have a sword, sell your cloak and buy one" - Luke 22:36
"They said, 'Lord, look, here are two swords.' And He said to them, 'it is enough.'" - Luke 22:38
"I carry a gun daily because as a cop, I saw what happened to the victims who didn't." - former NYC police officer John Cardillo
"An unarmed man can only flee from evil, and evil is not overcome by fleeing from it." - Let. Col. Jeff Cooper
"If violent crime is to be curbed, it is only the intended victim who can do it. The felon does not fear the police, and he fears neither judge nor jury. Therefore what he must be taught to fear is his victim." - Lt. Col. Jeff Cooper
"Among the many misdeeds of the British rule in India, history will look upon the Act depriving a whole nation of arms as the blackest." - Mohandas Ghandi
"If someone has a gun and is trying to kill you, it would be reasonable to shoot back with your own gun." - Dalai Lama