| P&I | Pensions & Investments 
| Others |
| P&I | Performance and Interface (Specification)
| Others |
| P&I | Principal and Interest
| Others |
| P&I | Protection and Indemnity Insurance
| Others |
| P/I | Present Illness
| Others |
| PI | 3.141592654
| Others |
| PI | Istiqlal Party
| Others |
| PI | Pacific Islander
| Others |
| PI | Package Insert
| Others |
| PI | Packet Interface
| Others |
| PI | Paducah and Illinois Railroad
| Others |
| PI | Page Impression
| Others |
| PI | Pages In
| Others |
| PI | Pain Intensity
| Others |
| PI | Pancreatic Insufficiency
| Others |
| PI | Par Interim
| Others |
| PI | Parallel Imports
| Others |
| PI | Paramagnetic Insulator
| Others |
| PI | Paranormal Investigator
| Others |
| PI | Parent Involvement
| Others |
| PI | Pareto Improved
| Others |
| PI | Parity Inner
| Others |
| PI | Pars Intermedia
| Others |
| PI | Participating Informant
| Others |
| PI | Partnership for Innovation
| Others |
| PI | Paternity Index
| Others |
| PI | Path Identification
| Others |
| PI | Path Identifier
| Others |
| PI | Patient Initials
| Others |
| PI | Patternology International
| Others |
| PI | Payload Interrogator
| Others |
| PI | Payment Instrument
| Others |
| PI | Pearl Index
| Others |
| PI | Pen and Ink (Document Update)
| Others |
| PI | Penal Interest
| Others |
| PI | Penalty Indicator
| Others |
| PI | Pengajian Inggeris
| Others |
| PI | Penile Implant
| Others |
| PI | Penning ionization [
| Others |
| PI | Per Inquiry
| Others |
| PI | Perfectly Incomplete
| Others |
| PI | Performance Improved
| Others |
| PI | Performance Improvement
| Others |
| PI | Performance Index
| Others |
| PI | Performance Indicator
| Others |
| PI | Perfusion Imaging
| Others |
| PI | Perfusion Index
| Others |
| PI | Perimeter Institute for Theoretical Physics
| Others |
| PI | Peripheral Iridectomy
| Others |
| PI | Perlite Institute
| Others |
| PI | Permanently Identified
| Others |
| PI | Perpetual Idiosy
| Others |
| PI | Perpetual Inventory
| Others |
| PI | Personal Information
| Others |
| PI | Personal Injury
| Others |
| PI | Personal Investigator
| Others |
| PI | Petrol Injection
| Others |
| PI | Phantom Investigator
| Others |
| PI | Philippine Islands
| Others |
| PI | Phosphate Ion
| Others |
| PI | Phosphatidyl Inositol
| Others |
| PI | Photo Impact
| Others |
| PI | Physically Impaired
| Others |
| PI | Physician Investigator
| Others |
| PI | Physiologic Index
| Others |
| PI | Piaui
| Others |
| PI | Pilipino Insurrecto
| Others |
| PI | Pisa (Provence)
| Others |
| PI | pituitary
| Others |
| PI | Plan Internacional
| Others |
| PI | Planetary Image
| Others |
| PI | Plant Information
| Others |
| PI | Plant Introduction
| Others |
| PI | Plaque Index
| Others |
| PI | Plaque Inhibition
| Others |
| PI | Plasticity Index
| Others |
| PI | Platform Independent
| Others |
| PI | Pneumococcal Infections
| Others |
| PI | Pocket Informant
| Others |
| PI | Point of Impact
| Others |
| PI | Poison Ivy
| Others |
| PI | Polarisation Index
| Others |
| PI | Police Informant
| Others |
| PI | Police Inspector
| Others |
| PI | Policy Iteration
| Others |
| PI | Political Informant
| Others |
| PI | Politically Incorrect
| Others |
| PI | Polyimide
| Others |
| PI | Pool Instructor
| Others |
| PI | Population Institute
| Others |
| PI | Portfolio Investment
| Others |
| PI | Position Independent
| Others |
| PI | Post Implantation
| Others |
| PI | Post Inaccrochable
| Others |
| PI | Post Infection
| Others |
| PI | Post Injection
| Others |
| PI | Post Inoculation
| Others |
| PI | Post Institutionalized
| Others |
| PI | Post Intelligencer
| Others |
| PI | Post Irradiation
| Others |
| PI | Post Ischaemic
| Others |
| PI | Post-Intelligencer
| Others |
| PI | Postal Inspectors
| Others |
| PI | Power Improved
| Others |
| PI | Power Intelligence
| Others |
| PI | Power Investiture
| Others |
| PI | Pre-Invoice
| Others |
| PI | Precision Instruments
| Others |
| PI | Preliminary Index
| Others |
| PI | Preliminary Investigation
| Others |
| PI | Prepaid Interest
| Others |
| PI | Presence Information
| Others |
| PI | Priceless Inn
| Others |
| PI | Primary Infection
| Others |
| PI | Primary Instructor
| Others |
| PI | Primary Investigator
| Others |
| PI | Principal Investigator
| Others |
| PI | Principle Investigator
| Others |
| PI | Priority Inherit
| Others |
| PI | Prison Industries
| Others |
| PI | Private Investigator
| Others |
| PI | Probability of Incapacitation
| Others |
| PI | Problem Investigator
| Others |
| PI | Procedural Item
| Others |
| PI | Process Information
| Others |
| PI | Process Innovation
| Others |
| PI | Process Integration
| Others |
| PI | Process Intelligence
| Others |
| PI | Processing Instruction
| Others |
| PI | Processor Interface
| Others |
| PI | Procurement Item
| Others |
| PI | Product Improvement
| Others |
| PI | Product Information
| Others |
| PI | Product Innovation
| Others |
| PI | Product Integration
| Others |
| PI | Product It
| Others |
| PI | Professionalism and Integrity
| Others |
| PI | Profitability Index
| Others |
| PI | Proforma Invoice
| Others |
| PI | Prognostic Index
| Others |
| PI | Program Improvement
| Others |
| PI | Program Integrator
| Others |
| PI | Program Introduction
| Others |
| PI | Programming Interface
| Others |
| PI | Project Idea
| Others |
| PI | Project Inform
| Others |
| PI | Project Instanciator
| Others |
| PI | Proliferation Index
| Others |
| PI | Property Inspector
| Others |
| PI | Propidium Iodide
| Others |
| PI | Proportional Integral
| Others |
| PI | Protease Inhibitor
| Others |
| PI | Protease Inhibitors
| Others |
| PI | Protocol Interpreter
| Others |
| PI | Provider Independent
| Others |
| PI | Public Information
| Others |
| PI | Public Inquiry
| Others |
| PI | Public Instruction
| Others |
| PI | Public Intoxication
| Others |
| PI | Public Involvement
| Others |
| PI | Publications Inquiry
| Others |
| PI | Pulmonary Index
| Others |
| PI | Pulmonary Infarction
| Others |
| PI | Pulmonary Insufficiency
| Others |
| PI | Pulse Induction
| Others |
| PI | Pulse Inversion
| Others |
| PI | Purchasing Instruction
| Others |
| PI | Pure Imported
| Others |
| PI | Pure Integrity
| Others |
| PI | Purposeful Interference
| Others |
| PI | Pyramid Inch
| Others |