**The Collaborative International Dictionary of English v.0.48:**

Np \Np\ n.
The chemical symbol for Neptunium, a transuranic element
having atomic number 93.
Syn: Neptunium, atomic number 93.
[WordNet 1.5]
**V.E.R.A. -- Virtual Entity of Relevant Acronyms (September 2014):**

NP
No Problem (telecommunication, Usenet, IRC)
**V.E.R.A. -- Virtual Entity of Relevant Acronyms (September 2014):**

NP
Network Performance
**The Jargon File (version 4.4.7, 29 Dec 2003):**

NP-
/N?P/, pref.
Extremely. Used to modify adjectives describing a level or quality of
difficulty; the connotation is often ?more so than it should be?. This is
generalized from the computer-science terms NP-hard and NP-complete;
NP-complete problems all seem to be very hard, but so far no one has found
a proof that they are. NP is the set of Nondeterministic-Polynomial
problems, those that can be completed by a nondeterministic Turing machine
in an amount of time that is a polynomial function of the size of the
input; a solution for one NP-complete problem would solve all the others. ?
Coding a BitBlt implementation to perform correctly in every case is
NP-annoying.?
Note, however, that strictly speaking this usage is misleading; there are
plenty of easy problems in class NP. NP-complete problems are hard not
because they are in class NP, but because they are the hardest problems in
class NP.