What does API stand for?

Absolute Position Indication - Nuclear energy (NRCH)

Academic Performance Index (FOTI)

Academic Press, Inc. - Publishers (MCD)

Accelerator Pedal with Idler - Automotive engineering

Accel International Corp. Productivity Interface - Computer science (BYTE)

Acceptable Periodic Inspection

Accountants for the Public Interest - Washington, DC

Accurate Position Indicator

Acquisition Program Indicator (MLEX)

Active Pharmaceutical Ingredient - A substance in a drug (PHAR)

Active Pharma. Ingredient

Activity Performing Inspection (SAA)

Actual Price Index (OTD)

Advanced Passenger Information (FOTI)

Advanced Pendulum Impact - Automotive safety

Advanced Performance Interceptor

Advanced Photonix'A' - AMEX symbol

Advanced Photonix, Inc. - AMEX symbol (SPSG)

Advanced Procurement Information (MCD)

Advance Performance Interceptor (SAUS)

Aerial Photo Interpretation (AUEG)

Aerial Position Indicator (SAUS)

Aerial Productions, Inc. - Air show performer (ASPC)

Aero Products International SAS (SAUS)

Affective Perception Inventory - Student personality test

Agence Angolaise de Presse et d'Information - Angolan Press and Information Agency

Agence de Presse Ivoirienne - Ivorian Press Agency

Aim Point Initiative (SAUS)

Aircraft Performance Indicator (ACAE)

Air Panama Internacional - ICAO designator (FAAC)

Air Photo Interpreter (SAUS)

Air-Pollutants Index

Air Pollution Index (SAUS)

Air Position Indicator - Air Force

Alabama Policy Institute (RCD)

Alabama Polytechnic Institute (MCD)

Alabamla Polytechnic Institute (SAUS)

Alaska Psychiatric Institute (SAUO)

Alignment Progress Indicator (KSC)

Alkaline Protease Inhibitor (DB)

Alliance for the Polyurethanes Industry (EA)

All-Purpose Interface - Computer science (HGAA)

Alternative Press Index

Alternative Press Index - A publication (SAUS)

Amalgamated Publishers, Inc.

Amalgamated Publishers, Incorporated (SAUO)

AMECEA Pastoral Institute (SAUO)

American Forest and Paper Association (EA)

American for Progressive Israel (SAUO)

American Home Products, Inc. (EFIS)

American Pacific Inflatables - NCIC boat manufacturer code (NCIC)

American Pacific Inflatables, Temecula, CA - Manufacturer code for watercraft hull identification number (USCG)

American Paper Institute (EA)

American Paramedical Institute - Hawaii

American Petroleum Industry (EEVL)

American Petroleum Institute (HEAS)

American Petroleum Institution (READ)

American Photonics, Inc. - Brookfield Center, CT (TSSD)

American Pipe Institute (SAUO)

American Pistol Institute (EA)

American Potash Institute - Later, PPI (EA)

American Poultry International (EA)

American Precision Industries, Inc. (EFIS)

American Prepaid Legal Services Institute (EA)

American Press Institute (EA)

American Psychical Institute

Americans for Progressive Israel (EA)

AMP Exploration & Mining Co. Ltd. - Vancouver Stock Exchange symbol

Amyloplast Pressure Index - Botany

Analysis Plus, Inc. - Commercial firm

Analytical Profile Index - Microbiology

AND Power Inverter (SAUS)

Angle Position Indicator

Animal Protection Institute of America (EA)

Ankle/Arm Pressure Index - Medicine (EDAA)

Antecedent Precipitation Index

Antenna Position Indicator

Anthocyanin Pigmented Juices - Food technology

Aperture Processed Imagers (ACAE)

Apia - Samoa Islands - Seismograph station code, US Geological Survey (SEIS)

Apiaca - Language code (ETLW)

Apiece - Telegraphy (PCTE)

Application Process Invocation - Telecommunications (OSI)

Application Program Interface - Telecommunications (OSI)

Application Programmer Interface (SAUS)

Application Programming Interface - Telecommunications

Application Programming Interfaces - Computer system (READ)

Applications Program Environment (SAUS)

Appreciation of Capital, Protection, Income - Finance

Arab Planning Institute - Research center (RCD)

Archconfraternity of Prayer for Israel (EA)

Architectural Periodicals Index - Royal Institute of British Architects - Information service or system (IID)

Area of Possible Incompatibility - Military (DNAB)

Armor-Piercing Incendiary - Ammunition

Arterial Pressure Index - Medicine (MELL)

Artifex Partners, Inc. - Commercial firm

Art in the Public Interest - Association (EA)

Asian and Pacific Islander (ADWA)

Assets Protection, Inc. - Commercial firm

Associated Paper Industries - British

Associated Photographers International (EA)

Associated Press International (TVEL)

Associated Press of India (SAUO)

Associate of the Plastics Institute - British

Association des Producteurs d'Isoglucose de la CE - Association of the Producers of Isoglucose of the European Community - Common Market

Association for Practitioners of Infection Control (MELL)

Association of Pharmaceutical Importers - British (DBA)

Association of Physicians in Industry (SAUO)

Association of Private Investors - British (DBA)

Association of Producers of Isoglucose of the EEC (SAUO)

Association Phonetique Internationale - International Phonetic Association

Association Professionals International (SAUO)

Astro-Psychology Institute (EA)

Atmospheric Pressure Ionization - Physics

Auerbach Power Index (NITA)

Australian Petroleum Institute

Automated Pellet Inspection - A system (ABAD)

Automated Pronunciation Instructor

Automatic Priority Interrupt - Computer science

Automatic Programming Instruction - Computer science

Autonomy Preference Index - Medicine (EDAA)

Aviation Professionals International - New Orleans

Axial Power Indicator - Environmental science (COE)