PP, pp or P_p may refer to:

Arts and entertainment

* ''Pianissimo'', a music term meaning ''very quiet'', from musical dynamics * Production code for the 1967–1968 ''Doctor Who'' serial '' The Enemy of the World'' *

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, a British preschool animated television series

Businesses and organisations

Political parties

* Patriotic Party (Guatemala) *

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) * People's Partnership (Trinidad and Tobago) * We Continue the Change (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, a polypeptide secreted by PP cells ** PP cell or pancreatic polypeptide cell * pro parte, abbreviated p.p., for a type of synonymy in taxonomy

Computing

* PP (complexity), a probabilistic polynomial time complexity class * PP-format (Post Processing Format), a file format for meteorological data * PP X.400, an e-mail protocol * Plug and play (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), 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 ("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, 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, Conservative politician in Canada. * PinkPantheress, singer