| Abbreviation | Definition |
|---|---|
| ATMI | Advanced Technology Materials Inc |
| ATMM | Audio Technologies for Music and Media |
| ATMOS | Advanced Technology Multiple Operating Systems |
| ATMT | Advanced Targeted Marketing Technology |
| ATMT | Advanced Technology Media and Telecommunications |
| ATN | Alabama Technology Network |
| ATO | All Technology Off |
| ATOM | Administrative Technology Organizational Management |
| ATOMS | Assistive Technology Outcomes Measurement System |
| ATP | Advanced Technology Partner |
| ATP | Advanced Technology Products |
| ATP | Advanced Technology Programs |
| ATP | Assistive Technology Partnership |
| ATP | Assistive Technology Practitioner |
| ATP | Assistive Technology Professional |
| ATPI | Applied Technology and Performance Improvement |
| ATPI | Applied Technology Performance Improvement |
| ATPL | Achieva Technology Pte Ltd |
| ATR | Advanced Technology And Research |
| ATR | Advanced Technology Recycling |