PL

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

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 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

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

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

File formats

 * , common filename suffix for Perl scripts
 * , common filename suffix for Prolog programs
 * , common filename suffix for 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

 * , 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., 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