PL
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
File formats
.pl, common filename suffix for Perl scripts.pl, common filename suffix for Prolog programs.pl, 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
.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
- 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")
- Private label, an arrangement between companies regarding the exclusive sale of goods
- Public law
- Public liability
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