| Abbreviation | Definition |
|---|---|
| APPL | APPL APplied Physics Letters |
| APPL | APplied Physics Letters |
| APPMT | Advanced Photon Processing and Measurement Technology |
| APPN | Asia Pacific Physics Newsletter |
| APRG | Applied Physics Research Group |
| APS | Advanced Photon Source |
| APS | Advanced Propagation System |
| APSC | Applied Physics Student Council |
| APT | Analytic Perturbation Theory |
| APULVZ | Altiplano-Puna Ultralow-Velocity Zone |
| AQ | Anomalous Quadrupole |
| AR | Absorptive Region |
| ARAC | Arithmetic Robot Application Control |
| ARB | Active Rere Beam |
| ARC | Accurate Radius Curvature |
| ARDS | Analysis of Rotor Dynamic Systems |
| ARES | Advanced Rheometric Expansion System |
| ARIE | Asynchronous Ratio Of Internal To External |
| ARL | Average Run Length |
| ARPA-E | Advanced Research Projects Agency - Energy |