Other
- Investigations Police of Chile (Spanish: Policia de Investigaciones de Chile), the state police force of Chile
- Pacific Data Images (1980–2000), former American computer animation production company, purchased by DreamWorks
- Pentaho Data Integration, Pentaho Data Integration (PDI, also called Kettle) is the component of Pentaho responsible for the Extract, Transform and Load (ETL) processes.
- Peripheral drift illusion
- Personal data interchange, an information sharing standard developed by the Versit Consortium
- Philippine Daily Inquirer
- Pilot direction indicator, guides a bomber pilot during a bomb run
- Plumbing & Drainage Institute, an American plumbing products manufacturers certification organization
- Polydispersity index, to the molecular weight distribution of polymers
- Portable Database Image (.pdi), a file format to store structured databases for reporting and analysis in a highly compressed way
- Powered Descent Initiate, the maneuver of the Apollo Lunar Module as it descended from lunar orbit to landing
- Pre Delivery Inspection, final inspection by the client of bespoke machinery and systems taken place just prior to delivering to the endures / customer
- Program and Debug Interface, an Atmel proprietary interface for external programming and on-chip debugging of computing devices.
- Projected Digital Image, a digital image used for projection, often in the context of a photographic competition
- Protein dispersibility index, a means of comparing the solubility of a protein in water
- Protein disulfide isomerase, an enzyme which catalyzes the formation and breakage of disulfide bonds in proteins
- Performance Daily Intake, a recommendation of daily vitamin and mineral intake, similar to RDI
- Pre-delivery inspection, the examination of a car (or other traded goods) before handover to the new owner.
- Project Development and Implementation, a structured phased approach for the execution of capital projects used in some parts of the Oil and Gas Industry in Canada.
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