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

* Premier League, the top English association football league * Pacific League, one of the two leagues in Japan's Nippon Professional Baseball * Pioneer Baseball League, a Rookie league in Minor League Baseball * Pioneer Football League, NCAA FCS conference

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

* .pl, common filename suffix for Perl scripts * .pl, common filename suffix for Prolog programs * .pl, common filename suffix for TeX font metric, TeX font property lists

Programming

* 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

* .pl, 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 * Litre, 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

Other uses

* Platoon leader, in the US Army * Plural, in grammar * Polish language (ISO 639-1 code "pl") * Private label, an arrangement between companies regarding the exclusive sale of goods * Public law * Public liability {{disambiguation