PP

PP, pp or P_p may refer to:

Arts and entertainment

• Pianissimo, a term meaning very quiet, from musical dynamics
• Pippi Longstocking, a fictional protagonist in a series of children's books by Swedish author Astrid Lindgren
• Kevin "PPMD" Nanney, professional Super Smash Bros. Melee player

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

• PayPal, an American company operating a worldwide electronic online payments system
• PediaPress, a software development and print-on-demand company located in Mainz, Germany
• Planned Parenthood, a reproductive health organization

Religion

• Papa (Latin for "pope"), when written "PP."
• Parochus (parish priest), when written P.P., used by clergy as post-nominal in Ireland and Great Britain

Science, technology, and mathematics

Biology and medicine

• Vitamin PP, the amide of nicotinic acid, also known as Nicotinamide
• Pancreatic polypeptide, a substance produced by the body during the process of digesting
  • PP cell, a cell producing pancreatic polypeptide
• Per protocol population, in clinical trials
• Preteen pregnancy
• 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 distributing meteorological data, developed in the UK
• PP X.400, an e-mail protocol
• Plug and play (P&P), a type of peripheral device
• Microsoft PowerPoint, a presentation program

Mathematics

• PP (complexity), a probabilistic polynomial time complexity class
• P–P plot, a probability plot which plots two cumulative distribution functions
• Percentage point, in statistics
• Perplexity, a measurement in information theory
• Process performance index (P_p), a tool used in statistical ppp

Other uses in science and technology

• Walther PP, a semi-automatic pistol
• Length between perpendiculars ("pp" or "p/p"), a nautical term
• Partial pressure, the pressure that would be exerted by one of the gases in a mixture if it occupied the same volume on its own
• Peak to peak (p–p), a way of measuring the amplitude of a signal
• Polypropylene, a common plastic polymer
• Proton–proton chain reaction, in nuclear physics

Other uses

• Per procurationem, from the Latin for "by agency", used when signing on behalf of someone else
• Pages (plural), in publishing (pp. particular pages), from Latin paginae, see Acronym and initialism#Representing plurals and possessives
• Past participle, a verb form used to indicate the passive voice or perfect tense
• Peter Principle, a concept in management theory

See also

• Peepee (disambiguation)