View source for PN

''PN'' may refer to:
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== 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 news website)|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 ==
=== Navies ===
* [[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
* [[National Party (Uruguay)|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 [[Provinces of Italy|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|Particle number]], in air-quality measurement
* [[petanewton]], a [[quadrillion]] [[Newton (unit)|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]]
* [[Primera Nacional]], second division association football league in Argentina
* [[Proper noun]], a linguistic term for the name of an entity
* ''[[Public News (Houston)|Public News]]'', an alternative newspaper in Houston (1982-1998)
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