(text messaging, Internet) Abbreviation of no problem. / no pagination / no place (of publication)

(South Africa) Initialism of National Party. / (Philippines) Initialism of Nacionalista Party.

(Internet) Initialism of now playing. / (Internet) Initialism of no problem.

Initialism of notary public. / Initialism of nurse practitioner. / Initialism of national park. / (linguistics) Initialism of noun phrase. / (nanotechnology) Initialism of nanoparticle.

(US) Initialism of National Park Service.

Initialism of nail-patella syndrome.

Initialism of no personal service. / Initialism of not personally served.

plural of NP

(computing theory, of a decision problem) That is both NP (solvable in polynomial time by a non-deterministic Turing machine) and NP-hard (such that any (other) NP problem can be reduced to it in polynomial time).

The state or condition of being NP-complete.