What does Aa stand for?

Biblioteca Nacional, Buenos Aires, Argentina - Library symbol - Library of Congress (LCLS)

High - Moody's bond rating - Investment term

Aalen - German license plate city code

A & A Foods Ltd. - Vancouver Stock Exchange symbol

Abalone Alliance - Safe energy clearing house - Association (EARSL)

Abbreviated Addressing - Computer science (ELAL)

Abbreviated Analysis - Military

Abdominal Auscultation - Medicine (MELL)

Able and Available - Unemployment insurance (OICC)

Abort Accept - Telecommunications (OSI)

Abort Acknowledge

Absolute Accuracy (ELAL)

Absolute Address (AAG)

Absolute Alcohol (SAUS)

Absolute Altimeter (ELAL)

Absolute Altitude - Navigation

Abstracting Automatic (SAUS)

Academic Alertness Test - Education (AEBS)

Academic Alliances (EA)

Academy Award - Academy of Motion Picture Arts and Sciences film award

Academy of Aphasia (EA)

Accelerated Aging - Durability testing

Accelerated Assemblies (NASA)

Accelerometer Assembly - NASA

Access Address (SAUS)

Access America - Commercial firm (EA)

Access Appliance

Access Arm (ELAL)

Access Authorization - Nuclear energy

Accommodation Address (LAIN)

Accompanied by Adult - British Board of Film Censors

Accountable Activity

Accountable Area - Environmental science (EPAT)

Accounting Automaton (SAUS)

Accreditation Authority - Military technology (DDF)

Accuracy in Academia (EA)

Acetic Acid - Organic chemistry (MAE)

Acetylacrolein - Organic chemistry

Achieved Availability (MCD)

Achievement Age - Psychology

Acoustic Absorptivity (ELAL)

Acoustics Associates (AAG)

Acquisition Aiding (SAUS)

Acrylic Acid - Organic chemistry

Acting Appointment

Acting Army (SAUS)

ActionAid - British (EAIO)

Action Area (ELAL)

Activation Analysis - Chemistry

Active Accounts (SAUS)

Active Adjunct (SAUS)

Active Air Defence - British - World War II

Active Alcohol (MELL)

Active Alkali - Chemistry

Active Area

Active Army

Active Assets

Active Assistance (IDYL)

Active Assisted (HGAA)

Active-Assistive - Range of motion - Orthopedics (DAVI)

Active Attached Reserve - Military

Active Avoidance - Medicine (DMAA)

Activity Account

Activity Area (SAUS)

Acts of the Apostles - New Testament book (BJA)

Actual Address (SAUS)

Actual Argument (SAUS)

Actual Availability (MCD)

Actual Completion Date of Activity - Business term

Acupuncture Analgesia - Medicine (DMAA)

Acute Abdomen - Medicine (MELL)

Acute Angle (SAUS)

Acute Appendicitis - Medicine

Acute Asthma - Medicine (MELL)

Ad Aperturam Libri - As the Book Opens - Latin (BARN)

Adaptive Array (ACAE)

Adaptive Automation

Add Address (SAUS)

Addicts Anonymous (EA)

Addington Association (EA)

Address Accumulator (SAUS)

Address Algorithm (SAUS)

Address Allocation (SAUS)

Address Appendix (SAUS)

Address Array (SAUS)

Address Assignment (SAUS)

Adenine Arabinoside - Medicine (DMAA)

Adenylic Acid - Biochemistry

Adhesive Active - Tire manufacturing

Adjustment Assistance

Adjuvant Arthritis

Administering Agency (SARE)

Administration on Aging - HEW - Defunct

Administrative Assistant

Administrative Authority (SAUS)

Adoption Act - British

Adoption Agency (SAUS)

Adrenal Androgen - Medicine (DMAA)

Adrenal - or Adrenocortical Autoantibody

Adriamycin, ARA-C - Cytosine Arabinoside - Antineoplastic drug (CDI)

Adult Accompaniment - Restricted to age 14 and up unless accompanied by an adult - Movie rating - Canadian

Adult Authority (OICC)

Advanced Algebra (SAUS)

Advanced Alloys - A company (ABAD)

Advanced Analytical (SAUS)

Advanced Aromatics - Fuels and lubricants

Adverse Action (EEVL)

Advertising Agency (NTCM)

Advices of Allowance (EEVL)

Aerial Array (SAUS)

Aeronautics Act (FOTI)

Aerosol Analyzer (KSC)

Aerotronic Associate (IAA)

Aerotronic Associates, Inc. (SAUO)

Affected Areas

Affiliate Artists (EA)

Affiliate Assembly - American Association of School Librarians

Affirmative Action - Employment policies for minorities

African Affairs - A publication

African American (MELL)

Afroasiatic - Linguistics (IEL)

After All - Message handling

After Arrival

Against Actuals (NUMA)

Aggregated Albumin (MAE)

Agoraphobics Anonymous (EA)

Agranulocytic Angina - Medicine (DMAA)

Agreed upon Amount (FOTI)

Agricultural Acreage (EURO)

Agriculture Act of 1970 (COE)

Ah-Ah - Lava-Flow - Hawaiian

Air Adviser (SAUS)

Air Almanac (SAUS)

Air Ambulance - Military technology (DDF)

Air America (SAUO)

Air Armament (NATG)

Air Assault - Military (DOMA)

Air Attache - British

Airborne Alert (AFM)

Aircraft Artificer - British

Airlift Association (EA)

Airlift/Tanker Association (EA)

Airplane Avionics (NASA)

Airship Association - British (EAIO)

Airship Association - U.S. (EA)

Air-to-Air - NASA

Alarm Apparatus (SAUS)

Albania - NCIC country-territory code (NCIC)

Albert Achillodynia (MELL)

Alcoa, Inc. - NASDAQ symbol (SPSG)

Alcoholics Anonymous (ASC)

Alcoholics Anonymous World Services (EA)

Alert Availability (MCD)

Algebraic Addition (SAUS)

Algorithmic Architecture - Military technology (DDF)

Alkalyzing Agent

All Ability School - British

All Abnormal - Clinical hematology

All - Text After - Specified Point - Message handling

All After - Aviation (DA)

All Along (ADA)

All-American (GOBB)

All-Around - Rodeo term

Allergic Angutis - Medicine (MELL)

Allergic Asthma - Medicine (MELL)

Allied Artists (SAUO)

Allyl Alcohol (SAUS)

Alopecia Areata - Medicine

Alpha Acid - Chemistry (BEBR)

Alphanumeric Address (SAUS)

Alternate Area (SAUS)

Alternative Analysis (PA)

Aluminium Company of America (SAUO)

Aluminum Association, Inc.

Aluminum Company of America - Wall Street slang names: "Ack Ack" and "All American" - NYSE symbol (SPSG)

Alveolar Abscess - Medicine (MELL)

Alveolar-Arterial - Physiology (MAE)

Always Afloat - Ship's charter

Alzheimers Association - Australia

Amarillo Area Office (SAUO)

Amateur Analyst

Ambassador Airlines (SAUO)

American Academy (SAUO)

American Airlines, Inc. - ICAO designator

American Airship Association (SAUO)

American Airways (SAUS)

American Anthology - A publication

American Arbitration Association (SAUO)

American Army (DAS)

American Assembly (EA)

American Association - Baseball league

Americans for the Arts - An association (NTPA)

Aminoacetone - Organic chemistry

Amino Acid - Biochemistry

Amino Acid Residue - Biochemistry

Aminoacyl

Amplitude of Accommodation - Ophthalmology

AMVETS Auxiliary (EA)

Amyloid-Associated - Protein - Medicine

Amyloid-Associated Protein - Biochemistry (DAVI)

Analgesic Abuse - Medicine (MELL)

Analysis Alarm - Engineering

Analysis of Alternatives (MLEX)

Analytical Abstracts Online - Royal Society of Chemistry - Information service or system (CRD)

Analytic Application (VLIE)

Anaplastic Anaemia - Medicine

Andrew Public Library, Alberta - Library symbol - National Library of Canada (NLC)

Anesthesiologist's Assistant - Medicine (DAVI)

Anglers Association (SAUO)

Anglo-American

Angular Accelerometer - NASA (MCD)

Angular Aperture (MCD)

Aniline Association (EA)

Anisylacetone - Organic chemistry

Annales Africaines - A publication (ILCA)

Annals Australia: Journal of Catholic Culture - A publication (APTA)

Ann Arbor (SAUS)

Ann Arbor Railroad Co. - AAR code

Annual Audit (SAUS)

Annulus Air (ABAD)

Anomalous Absorption (SAUS)

Ansett Airways (SAUO)

Antacid (MELL)

Antenna Array (SAUS)

Anterior Aorta

Anterograde Amnesia - Medicine

Ant Guard Activity - Ecology

Anthranilic Acid - Organic chemistry

Anti-Aero (SAUS)

Antiair - Nautical term (NTA)

Antiaircraft - Army

Antiaircraft Artillery (SAUS)

Antiarrhythmic Agent - Medicine (EDAA)

Antibody Activity - Immunology

Anticipated Answer (SAUS)

Anticipatory Account (ABAC)

Anticipatory Avoidance - Medicine

Antioxidant Activity - Food technology

Antiprotein Accumulator (DAVI)

Antiproton Accumulator - Particle physics

Antiquities Act of 1906 (COE)

Antonius Augustinus - Deceased, 1586 - Authority cited in pre-1607 legal work (DSA)

Aortic Aneurysm - Cardiology (DAVI)

Aortic Arch - Medicine (MELL)

AOUON - All of Us or None Archive - An association (EA)

Aplastic Anemia - Medicine (DMAA)

Apollo Applications - NASA

Apostolicam Actuositatem - Decree on the Apostolate of the Laity - Vatican II document

Application Architecture - Computer science (GART)

Application Association - Open Systems Interconnection (ODAA)

Approach Aid - Aviation (IAA)

Appropriate Authority - Office of Censorship - World War II

Appropriations and Allocations (OICC)

Approving Authority

Approximate Absolute - Temperature

Aptitude Area

Aptitude Test for Adults - Psychoeducational test

Arachidonic Acid - Biochemistry

Arbitrary Access (SAUS)

Arboricultural Association (EA)

Archaeology Abroad (EAIO)

Architect's Associate - Army research program

Argument Association (SAUO)

Arithmetical Administrator (SAUO)

Arithmetical Algorithm (SAUS)

Arithmetical Association (SAUO)

Arithmetical Average (SAUS)

Arithmetic Average

Arlington Annex - Navy

Armament Artificer - British and Canadian - World War II

Armature Accelerator

Armed Forces Americas

Armored Ambulance

ARMS - Action Research into Multiple Sclerosis of America (EA)

Army Act (ILCA)

Army Air Operations (MCD)

Arrival Angle - Army

Arrival Approved (SAUS)

Arteries - Medicine (DMAA)

Artificial Aerial (DEN)

Arts Anonymous (EA)

Aruba - GeoNet country code (GEON)

Aruba - Federal Information Processing Standard (FIPS) country code (GEON)

Asanteman Association (EA)

Asatru Alliance (EA)

Asbestos Abatement Co. (EFIS)

Asbestos Association (SAUO)

Ascending Aorta - Anatomy

Ascorbic Acid - Vitamin C - Biochemistry

Aspergillus Asthma

Assembly Area

Assets Accounting - Business term

Assignment of Authorization - FCC application purpose code (FCCC)

Assistant Adjutant

Assistant Administrator (GFGA)

Associate Administrator - NASA

Associate Advisor

Associate in Accounting

Associate in Arts

Association of Anaesthetists (DAVI)

Assumptionists (TOCD)

Aster Growth with Aster - Ecology

Astronautica Acta - A publication (SAUS)

Asymmetric Aminohydroxylation - Organic chemistry

Atheist Association (EA)

Athletic Association

Atlantic Area - Services to the Armed Forces - Red Cross

Atlas Agena - NASA

Atmospheric Applications (MCD)

Atomic Absorption - Chemical analysis

Atomic Age (IAA)

Attack Assessment - Military

Attainment Area (EEVL)

Attendance Allowance

Audible Alarm (IAA)

Audio Alert - Automotive electronics

Audiologic Assessment - Medicine (MELL)

Audit Agency

Audubon Artists (EA)

Auger Analysis - Medicine (EDAA)

Augusta Arsenal - Firearms use code - Firearms collecting (FAUC)

Augustiniani Assumptionis - Assumptionists - Roman Catholic men's religious order

Aurora - Society of Automotive Engineers auto manufacturer code for service information interchange

Australia Antigen - Immunology (DAVI)

Austro-Asiatic - Linguistics (IEL)

Authorized Absence (DAVI)

Authorized Allowance

Author's Alteration - Publishing

Auto Acquisition - RADAR

Auto-Alerting (IUSS)

Autoanalyzer

Auto Answer (CDE)

Automated Approval (FOTI)

Automated Assembly (FOTI)

Automated Attendant - Telecommunications (GART)

Automatic Abstracting (SAUS)

Automatic Acquisition (SAUS)

Automatic Answer - Telecommunications (TEL)

Automatic Approach (ACAE)

Automatic Approval (SAUS)

Automobile Accident (CPH)

Automobile Association - British

Autonomous Area

Auxiliary Accumulator (SAUS)

Auxiliary Algorithm (SAUS)

Auxiliary Assembly - JETDS nomenclature

Auxiliary Vessels - Navy symbol (MUGU)

Avenue of Approach - Army (AABC)

Average Acceleration

Average Adjuster - Insurance (DS)

Average Audience - Television ratings

Aviation Annex - Air Force

Awards Almanac - A publication

Axonal Arborization - Medicine (DMAA)

Bond Rating (SAUS)

Brassiere Cup Size (SAUS)

Dry-Type Self-Cooled - Transformer (IEEE)

High - Standard & Poor's bond rating - Investment term

Secondary Amyloidosis - Medical term

Shoe Width Less than A (BARN)

Sisters Auxiliaries of the Apostolate - Roman Catholic religious order

The American Adventure - Disney (DIS)

University of Arizona Accelerator, Tucson (SAUO)

Adjectives (SAUS)

After Arrival (MARI)

Albania - MARC country of publication code - Library of Congress (LCCP)

Amur River and Basin - MARC geographic area code - Library of Congress (LCCP)

Ana Partes - Equal Parts - Latin

arctic-alpine (SAUS)

Arteries (ADWA)

Author's Alteration (ADWA)

Of Each - Therapy term (CTAA)