The initials PPI have several meanings:

• Italian People's Party
• Parallel Peripheral Interface - a connection for driving LCD displays on processors such as the Blackfin
• Payment protection insurance
• People for Progress in India - a non-profit organization creating employment opportunities in India
• Personal & Private Information (PPI Data)
• Philips Phonographische Industries - the original name for Philips Records
• Phonographic Performance (Ireland) Limited
• Pirate Party International
• Producer Price Index, a metric used in economics
• Productivity Point International
• Progressive Policy Institute
• Practical Process Improvement

In Medicine:

• Proton pump inhibitor, a drug that reduces gastric acid secretion in the stomach
• Prepulse inhibition, the ability of nervous system to attenuate the startle response when a warning stimulus is given
• Patient Package Insert, an informational insert to be included, as required by law, with certain dispensed prescription medication.

In biochemistry

• A right-handed form of polyproline helix, a secondary structure in proteins
• pp I, a branch of the Proton-proton chain reaction
• Protein-protein interaction
• Peptidyl prolyl cis-trans-isomerase, a chaperone
• PP_i, a Pyrophosphate

In Computing:

• Per-Packet Information header, a meta information header format developed to provide 802.11n radio information.
• Plan Position Indicator, a map-like display on cathode ray tube device for radar applications
• Pixels per inch
• Programmable Peripheral Interface
• Portable PHP Interface

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