What does Pia stand for?

Playfair, WA - North American horse racing tracks (HRTC)

Passengers' Luggage in Advance (ODA)

Municipal Premium Income Trust - Formerly, Allstate Municipal Premium Fund - NYSE symbol (SPSG)

National Association of Professional Insurance Agents (NTPA)

Pacific Islands Association (EA)

Packaged Ice Association (EA)

Paid in Advance (WDMC)

Pakistan International Airlines (SAUS)

Pakistan International Airlines Corp. - ICAO designator (FAAC)

Panel-Information-Air Operation

Parallel Interface Adapter (SAUS)

Parapsychology Institute of America (EA)

Particle Impact Analyzer - Astrophysics

Partitioning Industry Association - British (DBA)

Passive Immunological Agglutination

Payload Interface Adapter - NASA (SSD)

Payload Interface Agreement (SAUS)

Peoria - Illinois - Airport symbol (OAG)

Peoria Airport, IL - Amtrak Busline code

Perfumery Importers Association - Defunct (EA)

Peril Insured Against (MARI)

Peripheral Interface Adapter - Computer science

Personal Information Appliance - Telecommunications

Personal Information Assistant

Personal Intelligent Agent (SAUS)

Personal Investment Authority - British

Personnel Inventory Analysis - Army

Perspective Inversion Algorithm - Computer science

Petervin Information Associates - Also, an information service or system (IID)

Petroleum Incentives Administration - Canada

Pharmaceutical Industries Association (SAUS)

Pharmaceutical Information Associates, Ltd. - Commercial firm

Phenylisopropyladenosine - Biochemistry

Philippine Institute of Architects (SAUS)

Phosphoroimmunoassays

Photoelectric Intravenous Angiography - Medicine (DMAA)

Photographic Importers Association - British (BI)

Piano - Softly - Music

Pilots International Association (EA)

Pima Bajo - Language code (ETLW)

Pine Institute of America (SAUS)

Pistolet Automatique N. Pieper - NCIC firearms make code (NCIC)

Pitten - Austria - Seismograph station code, US Geological Survey (SEIS)

Place Indicator in Accumulators (SAA)

Plasma Insulin Activity - Clinical chemistry

Plastics Industries Association - Ireland

Plastics Institute of America (EA)

Plug-in Administrator (SAUS)

Plug-In Amplifier

Pointed Instrument Assembly (ACAE)

Polycultural Institution of America

Positive Ion Accelerator

Positron Intensity Accumulator (MCD)

Postal Inspectors' Association - A union - British

Potentiometric Immunoassay - Clinical chemistry

Predominant Interest Agency (AAGC)

Preferential Trade Area (EBF)

Preinfarction Angina - Cardiology (DMAA)

Pre-Inspection Acceptance (SAA)

Preinstallation Acceptance

Pressure Indicating Alarm - Engineering

Primary Immunodeficiency Association - United Kingdom (EAIO)

Primary Inspection Agency - Federal Manufactured Housing Construction and Safety Standards - Department of Housing and Urban Development (GFGA)

Primary Insurance Account - Social Security Administration (OICC)

Primary Insurance Amount - Medicine (EDAA)

Principal Industry Activity - IRS

Printing Industries Association (SAUS)

Printing Industries of America (EA)

Printing Institute of America (SAUS)

Prison Industry Authority (SAUS)

Proceedings of the Irish Academy (SAUS)

Production Inventory Analysis (AAG)

Professional Insurance Agents - Alexandria, VA (EA)

Program Implementation Agency (SAUS)

Program Initiation Agreement (SSD)

Programmable Interconnect Array - Computer science (CIST)

Project Impact Analysis (NASA)

Project Initiation Agreement (SAUS)

Project Interface Adapter (SSD)

Propellant Isolation Assembly (ACAE)

Proprietary Industries Association (AAGC)

Psychiatric Institute of America - For-profit network of private psychiatric hospitals (EA)

Public and International Affairs - USCG (TAG)

Public Information Act

Public Information Adviser - NATO (NATG)

Public Information and Awareness (SAUS)

Public Intoxication Act - Australia

Pulse-Interval Analyzer (SAUS)

Pumice Institute of America (EA)

Purified Isophthalic Acid

White Haven Center, White Haven, PA - OCLC symbol (OCLC)