PN may refer to:

Arts and entertainment

  • Purple Noon, a 1960 film
  • Patriotic Nigras, a griefing group in the game Second Life
  • Portadown News, newspaper in Northern Ireland
  • Portadown News (satirical website), website based in Northern Ireland

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

  • Pakistan Navy
  • Peruvian Navy
  • Philippine Navy
  • Portuguese Navy

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
  • Pyridoxine, the alcohol form of vitamin B<sub>6</sub>

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 <math>n</math>, denoted by <math>P_n</math>
  • 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 <math>\mathbb{P}_n</math>
  • 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

  • Polynesian languages
  • Pottery Neolithic
  • Primera Nacional, second division association football league in Argentina
  • Proper noun, a linguistic term for the name of an entity
  • Public News, an alternative newspaper in Houston (1982-1998)