PP

PP, pp or P_p may refer to:

Computers and computing

• P&P, plug and play, a type of peripheral device used in computing
• PP-format, a Met Office proprietary file format for distributing climate data
• PP X.400 email system

Politics

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

Religion

• Papa (Latin for Pope), when written "PP."
• Parish priest, written "P.P."

Science, medicine and engineering

• Length between perpendiculars ("pp" or "p/p"), a nautical term
• Vitamin PP, also known as Nicotinamide
• Pancreatic polypeptide, a substance produced by the body during the process of digestion
  • PP cell, cell producing pancreatic polypeptide
• Peak to peak (p–p), a way of measuring the amplitude of a signal
• Percentage point
• Perplexity, a measurement in information theory
• Per protocol population in clinical trials
• Polypropylene, a very common plastic polymer
• PP (complexity), probabilistic polynomial time complexity class
• P–P plot
• Process performance index (P_p), a tool used in statistical calculations
• Proton–proton chain reaction, in nuclear physics

Other

• Planned Parenthood, a reproductive health organization
• As either pp or p.p., standing for per procurationem, from the Latin by agency - used when signing on behalf of someone else
• Pages (plural), in publishing, from Latin paginae, see Acronym and initialism#Representing plurals and possessives
• Past participle, a form of a verb which is used in a sentence to modify a noun or noun phrase, often represented by "pp." in dictionaries
• Pianissimo (very quiet), a term of musical dynamics
• Walther PP, a semi-automatic pistol
• Kevin "PPMD" Nanney, professional Super Smash Bros. Melee player
• Peter Principle

See also

• Peepee (disambiguation)