PPI may refer to:

Science and technology

Biochemistry

* PP_i, the anion P₂O₇⁴⁻, a

pyrophosphate In chemistry, pyrophosphates are phosphorus oxyanions that contain two phosphorus atoms in a linkage. A number of pyrophosphate salts exist, such as disodium pyrophosphate () and tetrasodium pyrophosphate (), among others. Often pyrophosphates a ...

* Polyproline I helix *

Protein–protein interaction Protein–protein interactions (PPIs) are physical contacts of high specificity established between two or more protein molecules as a result of biochemical events steered by interactions that include electrostatic forces, hydrogen bonding and t ...

Medicine

Patient and public involvement Public involvement (or public and patient involvement, PPI) in medical research refers to the practice where people with health conditions (patients), carers and members of the public work together with researchers and influence what is research ...

* Prepulse inhibition, of a later pulse *

Proton-pump inhibitor Proton-pump inhibitors (PPIs) are a class of medications that cause a profound and prolonged reduction of gastric acid, stomach acid production. They do so by irreversibly inhibiting the stomach's H+/K+ ATPase, H+/K+ ATPase proton pump. The body ...

, a class of medications *

Psychopathic Personality Inventory The Psychopathic Personality Inventory (PPI) is a personality test for traits associated with psychopathy in adults. The PPI was developed by Scott Lilienfeld and Brian Andrews to assess these traits in non-criminal (e.g. university students) pop ...

, a personality test * Psychophysiological Interaction, fMRI analysis technique

Computing

* Parallel Peripheral Interface, of the Blackfin processor * Programmable Peripheral Interface,

Intel 8255 The Intel 8255 (or i8255) Programmable Peripheral Interface (computer science), Interface (PPI) chip was developed and manufactured by Intel in the first half of the 1970s for the Intel 8080 microprocessor. The 8255 provides 24 parallel input/ou ...

chip * Programmable Peripheral Interconnect, in Nordic nRF microcontrollers *

Pixels per inch In digital imaging, a pixel (abbreviated px), pel, or picture element is the smallest addressable element in a raster image, or the smallest addressable element in a dot matrix display device. In most digital display devices, pixels are the sma ...

, of a display * Productivity Products International, commercializer of the Objective-C language

Other science and technology

* Gabarit passe-partout international, in railways * Picks per inch, a unit of textile measurement * Plan position indicator, radar display * Polymethylene polyphenylene isocyanate

Business and organizations

Italian People's Party (1919) The Italian People's Party (, PPI), also translated as Italian Popular Party, was a Christian democracy, Christian-democratic list of political parties in Italy, political party in Italy inspired by Catholic social teaching. It was active in t ...

(Partito Popolare Italiano), a political party *

Italian People's Party (1994) The Italian People's Party (, PPI) was a Christian democracy, Christian-democratic, Centrism, centrist and Christian left, Christian-leftist list of political parties in Italy, political party in Italy. The party was a member of the European Peop ...

(Partito Popolare Italiano), a political party *

Payment protection insurance Payment protection insurance (PPI), also known as credit insurance, credit protection insurance, or loan repayment insurance, is an insurance product that enables consumers to ensure repayment of credit if the borrower dies, becomes ill, disabled ...

* Peace Party of India, Uttar Pradesh *

Perusahaan Perdagangan Indonesia PT Perusahaan Perdagangan Indonesia (Persero) (), or PPI, is the only Indonesian state-owned trading house. Its business is in export, import and Distribution (business), distribution. PPI was formed through the merger of three former so-call ...

, trading company *

Philips Phonographische Industries Philips Records is a record label founded by Dutch electronics company Philips and in 1999 was absorbed into Dutch- American music corporation Universal Music Group. It was founded as Philips Phonographische Industrie in 1950. In 1946, Phil ...

, later Philips Records *

Phonographic Performance Ireland Phonographic Performance Ireland CLG (PPI) is a music licensing company which controls the public performance, broadcasting, reproduction of recording, and other rights of the recordings under its jurisdiction, which comprise the recordings of seve ...

, music licensing company *

Pirate Parties International Pirate Parties International (PPI) is an Political international, international Nonprofit organization, non-profit and non-governmental organization with headquarters in Brussels, Belgium. Formed in 2010, it serves as a worldwide organizati ...

Polly Peck International Polly Peck International (PPI) was a small British textile company which expanded rapidly in the 1980s and became a constituent of the FTSE 100 Index before collapsing in 1991 with debts of £1.3 billion, eventually leading to the flight of its ...

, former UK company *

Primarily Primates Primarily Primates (PPI) is a non-profit organization in Bexar County, Texas, that operates an animal sanctuary, housing 347 non-human primates and a variety of other birds and animals released from use in entertainment, research, or as rescues f ...

, primate sanctuary, Texas, US * Productivity Products International, US software company later renamed Stepstone *

Progressive Policy Institute The Progressive Policy Institute (PPI) is a non-profit 501(c)(3) organization that serves as a public policy think tank in the United States. The Democratic Leadership Council (DLC) founded it in 1989. ''The Washington Post'' has described the ...

, U.S. *

Pakistan Press International Pakistan Press International (PPI)Pareto priority index The Pareto priority index (PPI) is an index used to prioritize several (quality improvement) projects. It is named for its connection with the Pareto principle named after the economist Vilfredo Pareto. It is especially used in the surroundings o ...

, to prioritize projects *

Positive polarity item In grammar and linguistics, a polarity item is a lexical item that is associated with affirmation or negation. An affirmation is a positive polarity item, abbreviated PPI or AFF. A negation is a negative polarity item, abbreviated NPI or NEG. T ...

* Producer price index * Pulse Polio, immunisation campaign in India * Port Pirie Airport, IATA airport code "PPI" {{disambiguation