The guillotine is a machine used to execute people by decapitation (chopping off their heads). A guillotine is made of a heavy blade attached to a rack, which moves up and down on a vertical frame. When the rack is let go, it will fall down and the blade will cut the convict's head off.
A national producer number, or NPN, is a tool to protect individual insurance agents and agencies from identity theft and fraudulent representations made to the National Insurance Producer Registry, or NIPR.
In the medical community, PRN is an abbreviated term that stands for pro re nata. This means as needed. For nurses, there are multiple ways this term can be used. The main one refers to medication. Where a patient takes their medication as needed instead of on a schedule.