What does PI stand for?

Current Instructional Permit - Motor vehicle violation driver status code in state of North Dakota (MVRD)

Division of Plant Industry (SAUS)

Pacific Islands (SAUS)

Pacing Impulse - Cardiology (DAVI)

Pacing Indicator (SAUS)

Pacing Item (MCD)

Package Insert - Instructional leaflet distributed with certain prescription drugs - Also, PPI

Packaging Institute - Later, PI/USA (EA)

Packing Index (SAUS)

Paducah & Illinois Railroad - AAR code

Paleo-Indian (QUAC)

Palmaris Longus (DMAA)

Pancreatic Insufficiency - Gastroenterology

Pancreatic Lipase - Medicine (DMAA)

Panel Input

Panel Interlocking - Indian Railway (TIR)

Pansophic Institute - Defunct (EA)

Pantera International (EA)

Paper Insulated

Paper Insulation (SAUS)

Paracel Islands - ANSI two-letter standard code (CNC)

Parachute Infantry (SAUS)

Paradoxical Intention - V. E. Frankl (DIPS)

Parainfluenza (MELL)

Parallel Importation (DB)

Parallel Input - Computer science (BUR)

Parallel Interface (SAUS)

Parameter Identifier - Computer science (TNIG)

Parametric Industry (IAA)

Paranoid Ideation (DAVI)

Parental Investment - Biology

Parity Index - EEO

Parity Insert (SAUS)

Pars Intermedia - Medicine (EDAA)

Partial Interchangeability (SAUS)

Particle Integration (CAAL)

Particular Integral (SAUS)

Partido Independente - Independent Party - Costa Rica - Political party

Partido Intransigente - Intransigent Party - Argentina - Political party (PD)

Parti Independantiste - Quebec

Passeport International - International Passport - An association - France (EAIO)

Passive Immunity - Medicine (MELL)

Pasteur Institute (SAUS)

Pathfinder International (EA)

Patient's Interests - Medicine

Patrol Inspector - Immigration and Naturalization Service

Payload Interrogator - NASA (MCD)

Pen and Ink

Penetration Index (IAA)

Pepsin Inhibitor (OA)

Peptide Inhibitor (DB)

Perceptions, Inc. (EA)

Perceptual Isolation

Perfect Initials - Philately

Performance Improvement

Performance Index

Performance Indicator (MCD)

Performance Intensity (MAE)

Perinatal Injury - Neonatology (DAVI)

Per Inhalation (SAUS)

Per Inquiry - Advertising

Periodical Index Term (NITA)

Periodicals Institute (EA)

Periodic Inspection - Military (AFM)

Peripheral Interface - Computer science

Peripheral Inventory (SAUS)

Peripheral Iridectomy - Medicine

Perlite Institute (EA)

Permaculture International - Australia

Permeability Index - Clinical chemistry

Peroral Insulin - Medicine (EDAA)

Perpetual Inventory (SAUS)

Personal Identification

Personal Identity (SAUS)

Personal Import

Personal Income

Personal Injury - Insurance

Personal Injury Accident - British police term

Personal Investment - A publication (ADA)

Personality Inventory - Psychology

Petroleum Information Corp. (IID)

Petrol Injection - British

Pharmacopoeia Internationalis - International Pharmacopoeia

Phase-In

Phenanthroimidazole - Organic chemistry

Phenyl Isocyanate - Organic chemistry

Philippines - NCIC country-territory code (NCIC)

Phonographic Institute (SAUS)

Phosphatidylinositol - Also, PtdIns - Biochemistry

Photoelectric Inspection (ELAL)

Photographic Institute (SAUS)

Photographic Intelligence (SAUS)

Photographic Interpretation

Photographic Interpreter

Photo Intelligence (SAUS)

Photo International - Defunct (EAIO)

Photo Interpretation (SAUS)

Photointerpretation - or Photointerpreter

Photo Interpreter (SAUS)

Photointerpreter (IAA)

Photoionization - Physical chemistry

Physical Instruction (SAUS)

Physical Inventory (NRCH)

Physically Impaired

Physics International

Piaster - Monetary unit - Spain, Republic of Vietnam, and some Middle Eastern countries

Piedmont Aviation, Inc. - ICAO designator (OAG)

Pigeon Trainer - Navy

Pig Iron

Pilot International (EA)

Pilot Item (MCD)

Pilotless Intercepter - Air Force

Pineal Body (DB)

Pinedale - Wyoming - Seismograph station code, US Geological Survey - Closed (SEIS)

Pin Insulator (SAUS)

Pink (ROG)

Pinneberg - German license plate city code

Pipe - Freight

Pirelli - Tire casing code

Pistol, Semiautomatic - NCIC gun type code (NCIC)

Planetary Interior (SAUS)

Planet Imager (SAUS)

Plan Information (SAUS)

Planning Index (SAUS)

Plant Industry (SAUS)

Plant Inspection

Plant Introduction - Botany

Plaque Index - Dentistry

Plasma Iron - Hematology

Plastic Index

Plasticity Index (SAUS)

Plastics Institute (NADA)

Plastochron Index - Botany

Pleasure Island at Downtown Disney - Disney (DIS)

Plug-in (SAUS)

Plug-In Instrument (IAA)

Pneumatosis Intestinalis - Medicine

Point Initiating

Point Insulating

Point Interception (SAUS)

Point of Impact (AFM)

Point of Interception - Navigation

Point of Intersection

Point of Inversion (SAUS)

Poison Ivy - Campers' slang

Polar Inductor (SAUS)

Polling Interrupt (SAUS)

Polyimide - Organic chemistry

Polyisoprene - Organic chemistry

Polymer International (NS), Inc. - Toronto Stock Exchange symbol

Pompeiiana, Inc. (EA)

Ponderal Index - Measurement (DAVI)

Poni Iussit - Ordered to Be Placed - Latin

Popcorn Institute (EA)

Population Indication (SAUS)

Population Institute (EA)

Population Inversion (SAUS)

Porch Index - Psychiatry (DAVI)

Portfolio Insurance - Finance

Position Indicating (SAUS)

Position Indication (SAUS)

Position Indicator - Army

Positive Identification Feature

Positive Input (SAUS)

Positive Intelligence (LAIN)

Positive Interlace - Television

Postal Instruction (IAA)

Post-Impressionist (SAUS)

Postimpressionist Movement - Art

Postinfection - Medicine (DB)

Postinoculation - Medicine

Postischemic - Medicine

Potash Institute - Later, PPI (EA)

Potomac Institute - Defunct (EA)

Power Indicator (IAA)

Power Injection

Power Input

Power Interlock (IAA)

Practice Interception (SAUS)

Pratt Institute (SAUS)

Precision Instrument (NVT)

Predicted Impact (MCD)

Pregnancy Induced - Gynecology

Preinduction - Medicine

Preliminary Incubation (OA)

Preliminary Injunction - Legal term (HGAA)

Preliminary Input (SAUS)

Preliminary Inspection (MCD)

Preliminary Investigation (NASA)

Preliminary Issue

Premdor, Inc. - NYSE symbol (SPSG)

Premium Income (MARI)

Preparatory Interval - Psychometrics

Prepositioned Instruction - DoD

Present Illness - Medicine

Pressure Indicator - Nuclear energy

Presumptive Instruction (SAUS)

Primacord Interstage

Primary Infarction - Medicine

Primary Infertility (SAUS)

Primary Input (IAA)

Primary Item (ACAE)

Prime Implicant (SAUS)

Prime Interest Rate - Banking

Prime Item (SAUS)

Principal Investigator (MCD)

Printer - Navy

Printers Ink (SAUS)

Print Image (IAA)

Printing Impressions - A publication (DGA)

Priority Interrupt (IEEE)

Private Institution - British

Private Investigator

Priviledged Information (SAA)

Privileged Instruction (SAUS)

Proactive Inhibition - Psychology

Proactive Interference (EDAC)

Problem Input (SAA)

Procedure Interface (SAUS)

Process Image (NITA)

Process Instruction (SAUS)

Process Instrumentation - Nuclear energy (NRCH)

Process Interface (SAUS)

Process Interrupt (SAUS)

Processor Interface - Computer science (IAA)

Procurement Inspection (MCD)

Procurement Item (NASA)

Prodigy Internet

Product Improved

Product Improvement (MCD)

Production Index (SAUS)

Production Interval

Productivity Index (IEEE)

Professional Indemnity - Insurance

Profibus International (SAUS)

Program Indicator (IEEE)

Program Information

Program Innovations (ADA)

Program Instruction - Computer science (BUR)

Program Integrator - Military

Program Interface (SAUS)

Program Interrupt

Program Interrupter

Program Interruption

Program Introduction

Program Isolation - Computer science (ELAL)

Program Issuances - Assistance Payments Administration, HEW

Programmed Information - Computer science

Programmed Instruction

Programmed Interrupt (SAUS)

Programmed Introduction (MCD)

Program of Instrumentation (MUGU)

Project Inform (EA)

Project Initiation - Automotive engineering

Project Intrex - Massachusetts Institute of Technology (EA)

Prolactin Inhibitor - Endocrinology

Property Index - British police term

Propidium Iodide - Fluorescent dye

Proportional Integral (AAEL)

Proportional-Plus Integral - Digital control

Proprietary Information (SAA)

Propyl Isome (OA)

Protamine Insulin

Proteinase Inhibitor - Biochemistry

Protocol International (SAUS)

Protocol Interpreter (SAUS)

Proud Industries, Inc. - Commercial firm

Pseudo-Instruction (SAUS)

Pseudo Intelligence - False Intelligence (GIS)

Psychiatric Institute

Psychosynthesis Institute (EA)

Publication Instructions

Public Information

Public Investigation (SAUS)

Public Involvement (ABAC)

Puebla Institute (EA)

Pulmonary Incompetence - Medicine

Pulmonary Indices - Medicine

Pulmonary Infarction - Medicine

Pulmonary Intervertebral Disc - Medicine

Pulmonic Insufficiency - Medicine (RAWO)

Pulse Induction (ADA)

Pulse Input (SAUS)

Purge Isolation - Nuclear energy (NRCH)

Pyritization Index - Geoscience

Sunshine Airlines - Airline code - Australia

irregular pulsations (SAUS)

Per Inquiry (WDMC)

Pica - Typesetting - Also called pie (WDMC)

Professional Indemnity - Insurance (ODBW)

Inorganic Phosphate (SAUS)

Pandectae (Pisanae) Florentinae - A publication (DSA)

Parental Generation - Medicine (DMAA)

Payload Interrogator - NASA (NAKS)

Pen and Ink (NAKS)

Philippines (MILB)

Phosphate, Inorganic - Chemistry

Pillius Medicinensis - Flourished, 1165-1207 - Authority cited in pre-1607 legal work (DSA)

Preliminary Investigation (NAKS)

Pressure of Inspiration - Medicine

Principal Investigator (NAKS)

Program Introduction (NAKS)

Protease Inhibitor