PL, P.L., Pl, or .pl may refer to:

Businesses and organizations

Government and political

  • Partit Laburista, a Maltese political party
  • Liberal Party (Brazil, 2006), a Brazilian political party
  • Liberal Party (Moldova), a Moldovan political party
  • Liberal Party (Rwanda), a Rwandan political party
  • Parlamentarische Linke, a parliamentary caucus in Germany
  • Patriotic League (Bosnia and Herzegovina) (Bosnian: Patriotska Liga), a military organisation of the Republic of Bosnia and Herzegovina
  • Philippine Legislature, a legislature that existed in the Philippines from 1907 to 1935
  • Progressive Labor Party (United States), a United States communist party

Sports leagues

  • Palestine League, the top Palestinian football league
  • Premier League, the top English football league
  • Pacific League, one of the two leagues in Japan's Nippon Professional Baseball
  • Pioneer Baseball League, a Rookie league in American Minor League Baseball
  • Pioneer Football League, NCAA FCS conference
  • Priaulx League, senior football league on the island of Guernsey

Other businesses and organizations

  • Airstars Airways (IATA airline designator PL, 2000–2011)
  • Aeroperú (IATA airline designator PL, 1973–1999)
  • Papillion-La Vista Senior High School in Papillion, Nebraska, USA
  • Public library, a library maintained by government for public use
  • Professional Limited Liability Company, a limited liability company organized for the purpose of providing professional services

Places

  • PL postcode area, UK, a group of postcode districts in England
  • Poland (ISO 3166-1 country code)

Religion

  • PL Kyodan, a religious movement founded in Japan in the early 20th century
  • Patrologia Latina, a collection of Catholic writings published by Jacques-Paul Migne between 1841 and 1855

Science, technology, and mathematics

Chemistry

  • Pyridoxal, one form of vitamin B6
  • Pulchellidin (Pl), an anthocyanidin
  • Phospholipid, a class of lipids that are a major component of all cell membranes

Computing and telecommunications

File formats

  • <code>.pl</code>, common filename suffix for Perl scripts
  • <code>.pl</code>, common filename suffix for Prolog programs
  • <code>.pl</code>, common filename suffix for TeX font property lists

Programming

<!--- Procedural Programming would be PP, as Peripheral Processor/CDC 6600, not PL as in PLease delete this! -->

<!--- * Procedural programming, a programming paradigm ??????? -->

  • Programming language
  • PL/C, an instructional dialect of the PL/I computer programming language, developed at Cornell University in the 1970s
  • PL/I, a computer programming language developed in the 1960s
  • PL/SQL, Oracle's procedural language extension (inception in 1995)
  • PL/pgSQL, PostgreSQL's procedural language extension (inception 1998)

Telecommunication and networking

  • <code>.pl</code>, country code top-level domain for Poland
  • PL tone, a kind of squelching of an audio signal
  • Packet loss, one of the three main error types encountered in digital communications
  • Path loss, in telecommunication engineering
  • Presentation layer, one of the seven layers in the OSI model of computer networking
  • Digital Private Line, another form of tone squelching

Mathematics

  • Piecewise linear (disambiguation), in mathematics
  • Propositional logic, a system of evaluating truth-based propositions in terms of binary logic
  • PL (complexity), in complexity theory

Other uses in science and technology

  • Ice pellets (METAR weather code PL), a form of precipitation
  • Picolitre (pL), and petaliter (PL), units of volume
  • Pluto, a dwarf planet
  • Photoluminescence, the re-emission of photons from a surface following exposure
  • Pierre Levasseur (aircraft builder), a French aircraft designer
  • Plastic limit, in geotechnical engineering
  • PL / Positive Lock, a lens mount used on Arri cameras and lenses
  • pl., abbreviation for printing plates, often indicating the number of plate-based illustrations in a book
  • Adobe Prelude, an Adobe software

Other uses

  • Platoon leader, in the US Army
  • Plural, in grammar
  • Polish language (ISO 639-1 code "pl")
  • Political Liberalism, a 1993 book by the American philosopher John Rawls
  • Private label, an arrangement between companies regarding the exclusive sale of goods
  • Public law
  • Public liability
  • Patrol Leader (Scouting)