PP

PP, pp or P_p may refer to:

Arts and entertainment

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Businesses and organizations

Political parties

People's Party (Spain) (Partido Popular)
Pirate Party (Global)
Progressistas (Brazil) (Progressistas)
Progressive Party (Iceland)
People's Partnership (Trinidad and Tobago)

Other businesses and organizations

PediaPress, a German software company
Planned Parenthood, a reproductive health organization
Philipp Plein, logo

Religion

pp, Papa Pontifex, post-nominal used by popes

Science, technology, and mathematics

Biology and medicine

Vitamin PP or nicotinamide
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

PP (complexity), a probabilistic polynomial time complexity class
P–P plot, a probability plot
Percentage point, in statistics
Process performance index (P_p)

Other uses in science and technology

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 reaction, in nuclear physics

Other uses

pp., Per procurationem, when signing on behalf of another
pp, pages (of a book), see Acronym and initialism#Representing plurals and possessives