Zero Aggression Principle (“Zap”)
“Zero Aggression Principle”:
A libertarian is a person who believes that no one has the right, under any circumstances, to initiate force against another human being for any reason whatever; nor will a libertarian advocate the initiation of force, or delegate it to anyone else.
Those who act consistently with this principle are libertarians, whether they realize it or not. Those who fail to act consistently with it are not libertarians, regardless of what they may claim.
— L. Neil Smith
Formerly called the “Non-Aggression Principle”, or “NAP”