| Abbreviation | Definition |
|---|---|
| ATHS | American Truck Historical Society |
| ATHS | Ancestral Trails Historical Society |
| ATI | Asociacin de Tcnicos de Informtica |
| ATI | Asociación de Técnicos de Informática |
| ATI | Association of Informatics Technologists |
| ATIS | Adirondack Trail Improvement Society |
| ATL | Association for Tropical Lepidoptera |
| ATLAS | Alliance for Technology Learning and Society |
| ATMF | ATM Forum |
| ATOS | American Theatre Organ Society |
| ATS | American Technion Society |
| ATS | American Thoracic Society |
| ATS | American Tract Society |
| ATS | American Trauma Society |
| ATSE | Australian Academy of Technological Sciences and Engineering |
| ATSL | Accademia Toscana di Scienze e Lettere "La Colombaria" |
| ATSL | Accademia Toscana di Scienze e Lettere La Colombaria |
| ATSL | Tuscan Academy of Sciences and Letters "La Colombaria" |
| ATSL | Tuscan Academy of Sciences and Letters La Colombaria |
| ATSRF | :045<8O "5E=>;>38G5A:8E 0C: >AA89A:>9 $545@0F88 |