PP, pp or P_p may refer to:

Arts and entertainment

* ''Pianissimo'', a music term meaning ''very quiet'', from

musical dynamics In music, the dynamics of a piece are the variation in loudness between notes or phrases. Dynamics are indicated by specific musical notation, often in some detail. However, dynamics markings require interpretation by the performer depending on ...

* Production code for the 1967–1968 ''Doctor Who'' serial ''

The Enemy of the World ''The Enemy of the World'' is the fourth serial of the fifth season of the British science fiction television series ''Doctor Who'', which originally aired in six weekly parts from 23 December 1967 to 27 January 1968. The serial is set in Aust ...

'' *

Police Procedural The police procedural, police show, or police crime drama is a subgenre of procedural drama and detective fiction that emphasises the investigative procedure of police officers, police detectives, or law enforcement agency, law enforcement agencies ...

– a subgenre of procedural drama and detective fiction *

Peppa Pig ''Peppa Pig'' is a British preschool animated television series created by Neville Astley and Mark Baker. Produced by Hasbro Entertainment and Karrot Animation and formerly produced by Astley Baker Davies, the show follows Peppa, an anthro ...

, a British preschool animated television series

Businesses and organisations

Political parties

Patriotic Party (Guatemala) The Patriotic Party (, PP) was a conservative political party in Guatemala. It was founded on 24 February 2001 by retired army officer Otto Pérez Molina. Strongly compromised by corruption cases, the party fell from 36% support in 2011 to 4% in ...

People's Party (Spain) The People's Party ( ; known mostly by its acronym, PP ) is a Conservatism, conservative and Christian democracy, Christian democratic list of political parties in Spain, political party in Spain. The People's Party was a 1989 re-foundation o ...

(''Partido Popular'') *

Pirate Party Pirate Party is a label adopted by various Political party, political parties worldwide that share a set of values and policies focused on Civil and political rights, civil rights in the digital age. The fundamental principles of Pirate Partie ...

(Global) * Progressistas (Brazil) (''Progressistas'') *

Progressive Party (Iceland) The Progressive Party (, FSF) is an agrarian political party in Iceland. For most of its history, the Progressive Party has governed with the Independence Party. From 30 November 2017 until the 2024 election, the party was a coalition partne ...

* People's Partnership (Trinidad and Tobago) *

We Continue the Change We Continue the Change (; PP), sometimes translated as Change Continues, is a Centrism, centrist, anti-corruption List of political parties in Bulgaria, political party and formerly an electoral alliance in Bulgaria led by Kiril Petkov and Asen Va ...

(Bulgaria) ("Prodalzhavame promyanata")

Other businesses and organizations

* Pancasila Youth (''Pemuda Pancasila''), an Indonesian paramilitary organization * PediaPress, a German software company *

Planned Parenthood The Planned Parenthood Federation of America, Inc. (PPFA), or simply Planned Parenthood, is an American nonprofit organization

, a reproductive health organization * Philipp Plein, logo *

PayPal PayPal Holdings, Inc. is an American multinational financial technology company operating an online payments system in the majority of countries that support E-commerce payment system, online money transfers; it serves as an electronic alter ...

, an online payments company

Religion

* pp, ''Papa Pontifex'', post-nominal used by

pope The pope is the bishop of Rome and the Head of the Church#Catholic Church, visible head of the worldwide Catholic Church. He is also known as the supreme pontiff, Roman pontiff, or sovereign pontiff. From the 8th century until 1870, the po ...

Science, technology, and mathematics

Biology and medicine

* Vitamin PP or nicotinamide * Paliperidone palmitate, an antipsychotic medication *

Pancreatic polypeptide Pancreatic polypeptide (PP) is a polypeptide secreted by PP cells in the endocrine pancreas. It is a hormone and it regulates pancreatic secretion activities, and also impacts liver glycogen storage and gastrointestinal secretion. Its secreti ...

, a polypeptide secreted by PP cells **

PP cell Pancreatic polypeptide cells (PP cells), or formerly as gamma cells (γ-cells), or F cells, are cells in the pancreatic islets (Islets of Langerhans) of the pancreas. Their main role is to help synthesize and regulate the release of pancreatic po ...

or pancreatic polypeptide cell *

pro parte In taxonomy, the scientific classification of living organisms, a synonym is an alternative scientific name for the accepted scientific name of a taxon. The botanical and zoological codes of nomenclature treat the concept of synonymy differently. ...

, abbreviated p.p., for a type of synonymy in taxonomy

Computing

PP (complexity) In complexity theory, PP, or PPT is the class of decision problems solvable by a probabilistic Turing machine in polynomial time, with an error probability of less than 1/2 for all instances. The abbreviation PP refers to probabilistic polyno ...

, a probabilistic polynomial time complexity class *

PP-format The PP-format (Post Processing Format) is a proprietary file format for meteorological data developed by the Met Office, the United Kingdom's national weather service. Simulations of the weather are performed by the Met Office's Unified Model, whi ...

(Post Processing Format), a file format for meteorological data * PP X.400, an e-mail protocol *

Plug and play In computing, a plug and play (PnP) device or computer bus is one with a specification that facilitates the recognition of a hardware component in a system without the need for physical device configuration or user intervention in resolving reso ...

(P&P), a property of a peripheral device *

Microsoft PowerPoint Microsoft PowerPoint is a presentation program, developed by Microsoft. It was originally created by Robert Gaskins, Tom Rudkin, and Dennis Austin at a software company named Forethought, Inc. It was released on April 20, 1987, initially ...

, a presentation program

Mathematics

P–P plot In statistics, a P–P plot (probability–probability plot or percent–percent plot or P value plot) is a probability plot for assessing how closely two data sets agree, or for assessing how closely a dataset fits a particular model. It works b ...

, a probability plot, in statistics *

Percentage point A percentage point or percent point is the unit (measurement), unit for the difference (mathematics), arithmetic difference between two percentages. For example, moving up from 40 percent to 44 percent is an increase of 4 percentage points (altho ...

, in business writing and statistics *

Process performance index In process improvement efforts, the process performance index is an estimate of the process capability of a process during its initial set-up, ''before'' it has been brought into a state of statistical control. Formally, if the upper and lower sp ...

(P_p) * ''Presque partout'' (

almost everywhere In measure theory (a branch of mathematical analysis), a property holds almost everywhere if, in a technical sense, the set for which the property holds takes up nearly all possibilities. The notion of "almost everywhere" is a companion notion to ...

), in measure theory and analysis (is always lower case – 'pp'; in English 'ae' is often used instead.)

Other uses in science and technology

Paris Principles (cataloging) The Paris Principles (PP), also known as the Statement of Principles, defined the theoretical foundation for the creation of bibliographical cataloging rules for libraries. They were specified and agreed upon in October 1961 at the ''Conference o ...

, a theoretical foundation for the creation of bibliographical cataloging rules for libraries *

Walther PP The Walther PP (, or police pistol) series pistols are blowback-operated semi-automatic pistols, developed by the German arms manufacturer Carl Walther GmbH Sportwaffen. Design The Walther PP series feature an exposed hammer, a double-actio ...

, a pistol *

Length between perpendiculars Length between perpendiculars (often abbreviated as p/p, p.p., pp, LPP, LBP or Length BPP) is the length of a ship along the summer load line from the forward surface of the stem, or main bow perpendicular member, to the after surface of the ste ...

("pp" or "p/p"), the length of a ship * Peak to peak (p–p)

amplitude The amplitude of a periodic variable is a measure of its change in a single period (such as time or spatial period). The amplitude of a non-periodic signal is its magnitude compared with a reference value. There are various definitions of am ...

of a signal *

Polypropylene Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer Propene, propylene. Polypropylene belongs to the group of polyolefin ...

, a common plastic polymer *

Proton–proton chain The proton–proton chain, also commonly referred to as the chain, is one of two known sets of nuclear fusion reactions by which stars convert hydrogen to helium. It dominates in stars with masses less than or equal to that of the Sun, wherea ...

, in nuclear physics and astronomy

Other uses

* p.p., '' Per procurationem'', when signing on behalf of another * pp, pages (of a book), an example of the convention of doubling the letters in the acronym to indicate plural words, see * Percy Pig, a British brand of pig-shaped fruit-flavoured confectionery products * Peso Pluma, musician *

Pierre Poilievre Pierre Marcel Poilievre (born June 3, 1979) is a Canadian politician who has been the Leader of the Conservative Party of Canada, leader of the Conservative Party of Canada, Conservative Party since 2022. He was the Member of Parliament (Canad ...

, Conservative politician in Canada. *

PinkPantheress Victoria Beverley Walker (born 19 April 2001), known professionally as PinkPantheress, is a British singer, songwriter, and record producer. Her music is noted for its various samples and diaristic lyrics. Born in Bath, Somerset, and raised ...

, singer