Right to Carry - Laws which allow individuals to carry concealed handguns if they meet other state-legislated criteria.
Concealed Carry - The practice of carrying weapon, typically a handgun, in public in a concealed manner
Open Carry - The practice of allowing the permitted gun owner to carry a firearm on one's person in public
Stand Your Ground - Also called "no duty to retreat". Such laws remove the duty to retreat before using force in self-defense or to protect others from threats.
Castle Doctrine - A person attacked in his home can use reasonable force--including deadly force--to protect himself or another. Each state has different legal provisions. Appears to have come from the English common law allowing protection of one's home -- or castle.
Strawman Purchase - A loophole in licensing. A felon, or someone unable to purchase legally, arranges with someone who can to acquire a weapon.