PPI

For the Public Policy Initiative program on the English Wikipedia, see Wikipedia: WikiProject United States Public Policy.

PPI may refer to:

Biochemistry

• PP_i, the anion P₂O₇⁴⁻, a pyrophosphate
• PPI, peptidylprolyl isomerase a human chaperone protein also known as Prolyl isomerase
• PPI, a right-handed form of polyproline helix, a secondary structure in proteins
• PPI, Protein–protein interaction frequently referring specifically to the network of interactions between a subset of proteins in a living cell.

Indicators and indexes

• Pareto priority index, an index to prioritize projects
• Plan position indicator, a display of tactical information from RADAR or other sources.
• Producer Price Index, a metric used in economics, related to inflation

Insurance

• Payment protection insurance

Linguistics

• Positive polarity item

Media

• Pakistan Press International

Medicine

• Patient package insert, a document included with certain prescription medications
• Prepulse inhibition, the ability of the nervous system to attenuate the startle response when a warning stimulus is given
• Proton-pump inhibitor, a drug that reduces gastric acid secretion in the stomach
• Psychophysiological Interaction, an analysis technique for identifying task-related functional connectivity between brain regions

Organizations

• Italian People's Party (1919) (Partito Popolare Italiano), precursor of the Christian Democracy party
• Italian People's Party (1994) (Partito Popolare Italiano), one of the successor parties of Christian Democracy
• Peace Party of India, Indian political party in the state of Uttar Pradesh
• Philips Phonographische Industries, the original name for Philips Records
• Phonographic Performance (Ireland) Limited
• Pirate Party (Iceland)
• Pirate Parties International, umbrella organization of the international Pirate Party movement
• Polly Peck International, a British diversified company bankrupt and broken up since 1990
• Primarily Primates, an animal sanctuary for non-human primates in Texas, United States.
• Professionals Party of India, an Indian political party registered with the Election Commission of India
• Progressive Policy Institute, a U.S. public policy think tank

Technology

• Parallel Peripheral Interface, a connection for driving LCD displays on processors such as the Blackfin
• Gabarit passe-partout international, or the Berne gauge, a structure clearance standard in European railways
• Picks per inch, a unit of textile measurement
• Pixels per inch, the pixel density of devices such as computer displays, image scanners, and digital cameras
• Plan position indicator, a map-like display on a cathode ray tube device for radar applications
• Per-Packet Information, variety of Pcap file used in computer network analysis