Initialism for no problem

• Informal reassurance or acceptance

Initialism for now playing

• Label for currently playing media

Initialism for notary public

• Licensed official who certifies documents

Initialism for nurse practitioner

• Advanced practice registered nurse

Initialism for national park

• Protected area managed for conservation and recreation

Initialism for noun phrase

• Grammatical phrase headed by a noun

Initialism for nanoparticle

• Particle sized on the nanometer scale

Abbreviation for nondeterministic polynomial time (complexity class)

• Decision problems verifiable in polynomial time by a nondeterministic machine

Abbreviation for nosocomial pneumonia

• Pneumonia acquired during a hospital stay

Bibliographic abbreviation for no pagination

• Indicates a work without page numbers

Bibliographic abbreviation for no place of publication

• Indicates missing place of publication information