PP

PP, pp, Pp, or P_p may refer to:

Places

• Phi Phi Islands, in Thailand

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

Politics

• People's Party (Spain) (Partido Popular)
• Progressive Party (Brazil) (Partido Progressista)

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
• 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
• per protocol population in clinical trials
• Piecewise polynomial, see spline (mathematics)
• 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

• pp or p.p., for per procurationem, a signature made on behalf of someone else
• Pages, from Latin paginae, see acronyms
• 'Pianissimo' a term of musical dynamics
• Walther PP, a semi-automatic pistol
• per procurationem, from Latin by agency - used when signing on somebody else's behalf