(n): any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
(n): a registered nurse who has received special training and can perform many of the duties of a physician
(n): a graduate nurse who has passed examinations for registration
new puritan and, of course, Non-deterministic Polynomial time
Np. Chemical element symbol for Neptunium.
Clearly equal to P.
Abbreviation for "No Problem". Not sure if this originated in Netspeak or if it predated Teh Intarwebs.