| Abbreviation | Definition |
|---|---|
| ATSM | Acute Traumatic Stress Management |
| ATSM | Affine Term Structure Model |
| ATSR | Along Track Scanning Radiometer |
| ATTC | Automatic Transmission Test And Control Circuit |
| ATTF | Auto Theft Task Force |
| ATTIC | Alternative Treatment Technology Information Center |
| ATTIS | AT&T Information Systems |
| ATTIS | American Telephone And Telegraph Information Systems |
| ATTITUDE | Active Teens Taking Initiative To Understand Driving Experiences |
| attn | for the attention of |
| ATTN | Aids Therapeutic Treatment Now |
| ATTPU | Attempted Pick-Up |
| ATTRIB | report a file's Attributes |
| ATU | Antenna Tuning Unit |
| ATU | Accumulated Thermal Unit |
| ATU | Across The Universe |
| ATU | Arab Telecommunications Union |
| ATV | Advanced Tether Vehicle |
| ATV | Avian Tumor Virus |
| ATV | Abelson Virus Transformed |
| ATWB | Auto Tracking White Balance |
| ATWE | Aerobically Treated Wastewater Effluent |
| ATX | Advanced Technology Extended |
| AU | Gold |
| AU | Astronomical Unit |
| AU | Astronomical Units |
| AU | Atomic Units |
| AU | Absorbance Units |
| AU | Arbitrary Units |
| AU | Allocation Unit |
| AUB | Assemble Usenet Binaries |
| AUB | Athens Utilities Board |
| AUBB | Aurora University BaseBall |
| AUBC | Acute Uncomplicated Bacterial Cystitis |
| AUBC | Asian University Basketball Championships |
| AUBC | Aberdeen University Basketball Club |
| AUBF | Auricular Blood Flow |
| AUBF | Asian University Basketball Federation |
| AUBM | Autologous Unfractionated Bone Marrow |
| AUBP | Anomalia de la Union BilioPancreatica |
| AUC | Area Under the Curve |
| AUC | American University of the Caribbean |
| AUD | Arthritis Of Unknown Diagnosis |
| AUD-SOP | Auditing Standards Division Statements of Position |
| AUDIT | Alcohol Use Disorders Identification Test |
| AUDIX | Audio Information Exchange |
| AUDS | ALFA Ultra Deep Survey |
| AUDSEC | Auditing Standards Executive Committee |
| AUG | Australian University Games |
| AUG | Industry Audit Guides |