PP

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 1967–68 Doctor Who serial The Enemy of the World
• Police Procedural - a subgenre of procedural drama and detective fiction

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)
• Almost everywhere, in measure theory

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

See also

• Peepee (disambiguation)