PN

PN may refer to:

Arts and entertainment

Purple Noon, a 1960 film
Patriotic Nigras, a griefing group in the game Second Life

Business and economics

Pacific National, a rail freight company in Australia
Participatory notes, issued to unregistered overseas investors in Indian stock markets
Pennsylvania Northeastern Railroad (reporting mark PN)
Promissory note, a contract where one party makes an unconditional promise in writing to pay a sum of money to another
West Air (China) (IATA airline code PN)

Organizations

Navies

Political parties

National Renaissance Front, Partidul Naţiunii, a political party in Romania
Partit Nazzjonalista, a political party in Malta

Places

Pitcairn Islands (ISO 3166-1 country code)
Palmerston North, a city in New Zealand

Science, technology, and mathematics

Biology

Parenteral nutrition
Phylogenetic nomenclature, an approach to naming groups of living thingsfhiml

Electronics and computing

.pn, the country code top level domain (ccTLD) for Pitcairn Islands
p-n junction, a type of junction in electronics

Mathematics

Path graph of size $n$ , denoted by $P_{n}$
Petri net, one of several mathematical modeling languages for the description of distributed systems
Polish notation, a prefix notation proposed by Jan Łukasiewicz
Polynomial vector spaces, denoted by ${\mathbb {P}}_{n}$
Pseudorandom number sequence

Other uses in science and technology

Part number, an identifier of a particular part design used in a particular industry
Particle number, in air-quality measurement
Planetary nebula, in astronomy
Post-Newtonian expansion, an approximation of General Relativity
Proportional navigation, a concept in missile guidance systems
Pseudorandom noise, a deterministic sequence of pulses used in spread spectrum communication and rangefinding

Other uses

Pottery Neolithic
Proper noun, a linguistic term for the name of an entity
Public News, an alternative newspaper in Houston (1982-1998)

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