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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 – 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) (Partido Popular)
• Pirate Party (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, a reproductive health organization
• Philipp Plein, logo
• PayPal, an online payments company

Religion

• pp, Papa Pontifex, post-nominal used by popes

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, a presentation program

Mathematics

• P–P plot, a probability plot, in statistics
• Percentage point, in business writing and statistics
• Process performance index (P_p)
• Presque partout (almost everywhere), 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, a pistol
• Length between perpendiculars ("pp" or "p/p"), the length of a ship
• Peak to peak (p–p) amplitude of a signal
• Polypropylene, 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 Acronym and initialism § Representing plurals and possessives
• Percy Pig, a British brand of pig-shaped fruit-flavoured confectionery products
• Peso Pluma, musician
• Pierre Poilievre, Conservative politician in Canada.
• PinkPantheress, singer

See also

• Peepee (disambiguation)

• Disambiguation pages