Editing PPI

'''PPI''' may refer to:
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==Science and technology==
===Biochemistry===
* PP<sub>i</sub>, the anion P<sub>2</sub>O<sub>7</sub><sup>4−</sup>, a [[pyrophosphate]]
* [[Polyproline I helix]]
* [[Protein–protein interaction]]

===Medicine===
* [[Patient and public involvement]]
* [[Prepulse inhibition]], of a later pulse
* [[Proton-pump inhibitor]], a class of medications
* [[Psychopathic Personality Inventory]], a personality test
* [[Psychophysiological Interaction]], fMRI analysis technique

===Computing===
* [[Parallel Peripheral Interface]], of the Blackfin processor
* Programmable Peripheral Interface, [[Intel 8255]] chip
* [[Programmable Peripheral Interconnect]], in Nordic nRF microcontrollers 
* [[Pixels per inch]], of a display
* [[Stepstone|Productivity Products International]], commercializer of the [[Objective-C]] language

===Other science and technology===
* [[Gabarit passe-partout international]], in railways
* Picks per inch, a [[units of textile measurement#Picks per inch|unit of textile measurement]]
* [[Plan position indicator]], radar display
* [[Polymethylene polyphenylene isocyanate]]

==Business and organizations==
* [[Italian People's Party (1919)]] (Partito Popolare Italiano), a political party
* [[Italian People's Party (1994)]] (Partito Popolare Italiano), a political party
* [[Payment protection insurance]]
* [[Peace Party of India]], Uttar Pradesh
* [[Perusahaan Perdagangan Indonesia]], trading company
* [[Philips Phonographische Industries]], later Philips Records
* [[Phonographic Performance Ireland]], music licensing company
* [[Pirate Parties International]]
* [[Polly Peck International]], former UK company
* [[Primarily Primates]], primate sanctuary, Texas, US
* Productivity Products International, US software company later renamed [[Stepstone]]
* [[Progressive Policy Institute]], U.S.
* [[Pakistan Press International]], a  news agency

==Other uses==
* [[Pareto priority index]], to prioritize projects
* [[Positive polarity item]]
* [[Producer price index]]
* [[Pulse Polio]], immunisation campaign in India
* [[Port Pirie Airport]], IATA airport code "PPI"
{{disambiguation}}