| Abbreviation | Definition |
|---|---|
| ASOG | Architectural Style Online Guide |
| ASPCA | Architectural Studies for Performance Critical Applications |
| ASPCA | Architectural Studies for Performance Critical Applications |
| ASPE | American Society of Plumbing Engineers |
| ASRB | Architectural and Site Review Board |
| ASRG | Architecture Student Research Grant |
| ASW | Apparent Source Width |
| ASW | Architectural Salvage Warehouse |
| ASWD | Architectural Salvage Warehouse of Detroit |
| ATAM | Architecture Tradeoff Analysis Method |
| ATAM | Architecture Tradeoffs Analysis Method |
| ATAM | Architecture type analysis method |
| ATB | Arch, Top, and Back |
| ATBCB | Architectural Transportation Barriers Compliance Board |
| ATCA | Advanced Telecom Computer Architecture |
| ATCA | Advanced Telecommunications Computing Architecture |
| ATCM | Architectural Technology and Construction Management |
| ATLAS | Atomic-terrace low-angle shadowing |
| ATRU | Architectural Technology Research Unit |
| AU | Absorbance Unit |