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PIPrivate Investigator
pi[not an acronym] name for Greek symbol representing the ratio of the circumference of a circle to its diameter; approximately 3.1416
PIPer Inquiry
PIPolitically Incorrect
PIProduct Information
PIPrivate Investigations (movie)
PIProcess Integration
PIPrincipal Investigator
PIPublic Information
PIProgram Improvement
PIProcess Improvement
PIPhosphate (Inorganic)
PIProtease Inhibitor
PIProfessional Indemnity (insurance coverage)
PIPlant Industry (Commonwealth Scientific and Industrial Research Organisation; Australia)
PIPackage Insert (medications)
PIProgram Information
PIPiauí (Brazilian state)
PIPost Intelligencer (newspaper, Seattle, Washington)
PIProcessing Instruction
PIPunto Informatico
PIPaging (assembly language ASM51 assembler control)
PIPrivacy International (human rights group)
PIPulse Induction
PIProgram Instructions
PIPresque Isle (Michigan)
PIPropidium Iodide
PIProportional-Integral (controller)
pIIsoelectric Point (chemistry)
PIProcess Industries
PIPredictive Index
PIPropriedade Intelectual (Intellectual Property, Brazil)
PIPacific Institute
PIBlood Clotting
PIParris Island
PIPreliminary Injunction
PIPower Integrations
PIPass Interference (football)
PIPandemic Influenza
PIPrivate Idaho
PIPraktische Informatik (German: Applied Informatics)
PIPrimary Immunodeficiency
PIPaedagogisches Institut (Vienna, Austria)
PIProgram Integrity
PIProcess & Instrumentation
PIPhilippine Islands (slang)
PIParallel Interface
PIPublic Intoxication (law enforcement)
PIPosition Indicator
PIPulsatility Index
PIProduct Integration
PIPower Interface
PIProduct Improvement
PIProfitability Index
PIProgram Index
PIPlouffe's Inverter
PIPressure Indicator (industrial control description)
PIPacific Internet (Internet Service Provider)
PIPost Inoculation
PIPrecision Instrument
PIProductivity Index (oil and gas well performance)
PIParanormal Investigator
PIProvider Independent (IP address space assigned by IANA)
PIProgram Identification
PIProforma Invoice
PIProgrammed Instruction
PIProyectos Industriales
PIProject Identification (number)
PIPrediction Interval
PIPacket Interface
PIPartner Institution
PIProductivity Increase
PIPage Impression (Internet advertising)
PIProduct Integrity
PIPriority Inheritance
PIProtocol Interpreter
PIPaper Insulated
PIInternational Protocol
PIPrison Industry
PIProgram Interruption
PIParanoid Ideation
PIPanicle Initiation
PIPhosphorus Index
PIPar Intérim (French: Deputizing)
PIParameter Identifier (ITU-T)
PIIstiqlal Party (Independence Party, Morocco)
PIParticular Integral
PIPatente de Invenção (Patent, Brazil)
PIPrime Implicant
PIPrimary Injection
PIProjets Individuels
PIPortable Interceptors
PIPrimary Investigations
PIPusat Informasi (Indonesian: Information Center)
PIPrécompte Immobilier (French: tax on real estate)
PIParents for Inclusion
PIPrice Integrity
PIParadigm Infinitum (Singapore)
PIProgram Isolation (IBM)
PIPhysicist Interface
PIPraendex Incorporated (Wellesley, MA)
PIPrincipal Insured
PIPrintImage International
PIParameter Indicator
PIProspective Internationale
PIPerceptually Impaired
PIPulse Inverter
PIPerception Immédiate (French)
PIProjector Infantry
PIParent Initial
PIPsykoterapiinstitut (Stockholm, Sweden)
PIPaducah & Illinois Railroad
PIProcurement Instruction
PIPage Interleaving
PIPsicología Integrada (Portugese)
PIProfessional Informant
PiIonized Phosphorus
PIPampers Institute (UK)
PIPassive Intercept
PIProfil Infirmier
PIProbationary Instructor
PIPallidum Internum
PIPasses Intercepted (soccer)
PIPersonal Inspection
PIPolynomial Identity (mathematics)
PIPopcorn Institute (Chicago, IL)
PIPlasticity Index
PIPerformance Insight (Oracle)
PIPhysik Instrumente
PIPlaque Index (oral hygiene)
PIPerformance Indicator
PIPoint of Inflection (engineering)
PIPoison Ivy
PIPerlite Institute (Staten Island, NY)
PIPeripheral Iridotomy
PIPaperi-Insinöörit (Finnish: Paper Engineers)
PIPlatform Initialization (Specification)
PIPhysics International
PIPolice Interceptor
PIPursuit Inc.
PIPinellas (plant; Florida)
PIPersonal Identifier
PIPlease Inquire
PIPersistently Infected
PIPearl Islands (Hawaii)
PIPhiladelphia Inquirer (newspaper)
PIPolicy and International Affairs
PIPlant Integrity
PIPetroleum Institute
PIPlanet Internet
PIPaternity Index
PIPer Inch
PIPinneberg (auto license plate)
PIPerpetual Inventory
PIPerimeter Institute for Theoretical Physics
PIPayload Integrator
PIPenile Implant
PIPerformance Improvement
PIPerformance Index
PIPeriodic Inspection
PIPersonal Injury (legal)
PIPhoto Interpretation
PIPhoto Interpreter
PIPhysical Inventory
PIPhysically Impaired
PIPleasure Island (Disney World)
PIPlug In
PIPoint Initiating
PIPoint of Impact
PIPoint of Intersection
PIPolicy Issuance (insurance)
PIPolyisocyanurate (rigid foam contruction material)
PIPopulation Institute
PIPlant Information (real-time software products such as SCADA)
PIPisa (Tuscany, Italy)
PIPerforated Initials (philately)
PIPersonal Investigator (less common)
PIPurchasing Instruction
PIPhase I (clinical studies)
PIPCNA (Proliferating Cell Nuclear Antigen) Labeling Index
PIPentium I (Intel)
PIPonderal Index
PIPhysician Information
PIPhotoImpact (digital imaging software)