What does ao stand for?

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

South China Sea and Area - MARC geographic area code - Library of Congress (LCCP)

Abdominal Aorta - Medicine (DB)

Abnormal Occurrence (NRCH)

Abort Output (SAUS)

Absolute Output - Computer science

Abstract Object (VLIE)

Abwehroffizier - Counterintelligence Officer - German military - World War II

Academy of Osseointegration (NTPA)

Access Opening - Technical drawings

Accountable Officer (ALAC)

Accountant - or Accounting Officer

Account Of (ACAE)

Accounts Office - Army (AABC)

Accoustical Ohm (ELAL)

Accumulator Overflow (SAUS)

Achievement Orientation - Psychology (AAMN)

Acid Output - Physiology

Acoustic/Optical (SAUS)

Acridine Orange - Dye

Action Officer - Air Force (AFM)

Active Oxygen (EDCT)

Actual Operation (SAUS)

Adaptive Optics (ACAE)

Adder Output (SAUS)

Adding Operator (SAUS)

Add-On (SAUS)

Addressing Operation (SAUS)

Address Operation (SAUS)

Address Order (SAUS)

Adirondack Ore Mines - Federal Railroad Administration identification code

Adjustable Objective

Adjusted Output - Computer science

Administration Office

Administrative and Overhead - Costs (KSC)

Administrative Officer (GFGA)

Administrative Operations

Administrative Order (DLA)

Administrator's Office (EEVL)

Admiralty Office - Navy - British (ROG)

Adult Operculum

Adults Only (ADA)

Advanced Organisation (SAUS)

Aerial Observer - Military (NVT)

Aeromere SpA - Italy - ICAO aircraft manufacturer identifier (ICAO)

Aeronautical Order (AFM)

Aerosol Obscurant (MCD)

Affiliation Officer - British

After Orders (MCD)

Agent Orange - Herbicide (MELL)

Airborne Observer - Military (VNW)

Airborne Optics (ACAE)

Aircraft Operations (FOTI)

Aircraft Operator (DA)

Airdrome Officer

Airlock Outfitting (SSD)

Air Observer - Military - British

Air Officer - RAF - British

Air Operator (NRCH)

Air Ordnance - Special duties officer - British

Air Over (MSA)

Air Overseas (SAUS)

Airway Obstruction - Medicine (MELL)

Akridinorange (SAUS)

Aldehyde Oxidase - An enzyme

Algo Group, Inc. - Toronto Stock Exchange symbol

Alliance for Opportunity - Defunct (EA)

Alphabetic Order (SAUS)

Alphanumeric Order (SAUS)

Alpha Omega International Dental Fraternity - An association (NTPA)

Ambulance Officer

AMERCO - NYSE symbol (SAG)

American Online (SAUS)

American Optical Corp.

America Outdoors (NTPA)

Among Others

Amphibious Operations - Military (IUSS)

Amplifier Output - Computer science

Analog Output - Computer science (NASA)

AND Operation (SAUS)

AND Operator (SAUS)

And Others

Angle of (SAUS)

Angola - ANSI two-letter standard code (CNC)

Angola - NCIC country-territory code (NCIC)

Ankle Orthosis - Medicine (MELL)

Anno Ordinis - In the Year of the Order - Used by the Knights Templar - Freemasonry (ROG)

Annotated Outline (SAUS)

Announcement of Opportunity - NASA (MCD)

Anodal Opening - Physiology

Anovulation - Medicine (MELL)

Answer Only (TEL)

Answer Originate (IAA)

Anterior Oblique (MAE)

Antioxidant (MELL)

A-Operator (SAUS)

Aorta (ADWA)

Aortic Opening - Medicine (RAWO)

Aortic Valve Opening - Cardiology

Appointing Order

Arcane Order - Defunct (EA)

Archives Office (ADA)

Arctic Oscillation

Area Office

Area of Operation - Military (VNW)

Area of Operations - Military (AABC)

Arithmetic Operation (SAUS)

Arithmetic Operator (SAUS)

Arithmetic Organ (SAUS)

Arkansas & Ozarks Railway - AAR code

Army Order - British

Ars Orientalis: The Arts of Islam and the East - A publication

Artillery Observation (SAUS)

Artillery Officer (SAUS)

Artillery/Ordnance (MCD)

Assembly Order

Assembly Outline

Assisting Organization (ACAE)

Assist Order

Astronomical Observatory

Asynchronous Operation (SAUS)

Atlantic Ocean Region - Communications term (DCT)

Atmosphere-Ocean (CARB)

At Occupation - An underwriting designation for an occupational accident - Insurance

Atomic Orbital

At Once - Telegraphy (PCTE)

Atrioventricular Opening (SAUS)

Atrioventricular Valve Opening (DAVI)

Attack Operations (SAUS)

Atypical Odontalgia - Dental pain that has no apparent organic cause

Audio-Only

Audio Operator (NTCM)

Audio Oscillator

Audit Organization (DNAB)

Auramine-O - A biological stain

Auriculoventricular Valve Opening - Medicine (DB)

Australian Officer (SAUO)

Authenticator Organization (MCD)

Authorized Order

Autoimmune Oophoritis - Medicine

Automated Office (VLIE)

Automated Operation (ELAL)

Automated Operator (VLIE)

Automatic Observer

Autonomous Oblast - Former USSR

Auxiliary Office (COE)

Auxiliary Oiler (MCD)

Auxiliary Operation (SAUS)

Auxiliary Oscillator

Avanguardia Operaia - Worker's Vanguard - Italy - Political party (PPE)

Average Out - Business term

Aviation Officer - MTMC (TAG)

Aviation Ordnanceman - Navy rating

Avisco - ICAO designator (AD)

Awards and Obligations (GFGA)

Axio-Occlusal - Dentistry

Fragmentation bomb (SAUS)

Office of the Administrator - Environmental Protection Agency (AEPA)

Oiler - Fuel tanker - Navy ship symbol

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

Aorta - Cardiology (AAMN)

Operational Availability