| Abbreviation | Definition |
|---|---|
| ATA | Analog Telephone Adaptor |
| ATAPI | Advanced Technology Application Programming Interface |
| ATDPS | Automated Tablet Dispensing and Packaging System |
| ATE | Asynchronous Terminal Emulation |
| ATIP | Absolute Time In Pregroove |
| ATM | Automatic Teller Machine |
| ATMG | Auto Tuning for Multicore and GPU |
| ATWB | Auto Tracking White Balance |
| ATX | Advanced Technology Extended |
| AU | Access Unit |
| AU | Audio Unit |
| AUD | Audio |
| AUI | Attachment Universal Interface |
| AUT | Array Under Test |
| AUX | AUXiliary device |
| AV | Adjusted Volume |
| AVA | Active Vision Agent |
| AVA | Adaptec Value Adapter |
| AVBC | Adaptive Variable Bias Control |
| AVC | Actuator Valve Controller |