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
- Perikatan Nasional, a political coalition in Malaysia
- Partido Nacional (Uruguay), a political party in Uruguay
Places
- Penang
- Pitcairn Islands (ISO 3166-1 country code)
- Palmerston North, a city in New Zealand
- Province of Pordenone, a province in the autonomous region of Friuli Venezia Giulia in Italy
Science, technology, and mathematics
Biology
- Parenteral nutrition
- Phylogenetic nomenclature, an approach to naming groups of living things
Electronics and computing
- .pn, the country code top level domain (ccTLD) for Pitcairn Islands
- p–n junction, a type of junction in electronics
- Adobe Presenter, an Adobe software
Mathematics
- Path graph of size , denoted by
- 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
- 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
- petanewton, a quadrillion newtons
- 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
- Phosphorus mononitride (PN), an inorganic compound found in space
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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