| 0x | Zero-X fictitious Earth spacecraft in Supermarionation productions | |
| 16Th Ed WR | 16Th Edition Wiring Regulations | |
| A | Asymmetrical (or assymetrical) | |
| A+I | Architecture + Interiors magazine | |
| A/E | Architect/Engineer | |
| A/F | Across Flats | |
| AAA | Alberta Association of Architects | |
| AAA | Architecture and Allied Arts | |
| AAACE | Albanian Americans in Architecture Construction and Engineering | |
| AAAD | Academy of Arts Architecture and Design | |
| AAAD | Academy of Art Architecture and Design | |
| AAAD | Academy of Arts, Architecture and Design | |
| AAAD | Aditya Academy of Architecture Design | |
| AAAE | Asian American Architects and Engineers | |
| AAAT | Architecture Atelier Akio Takatsuka | |
| AAC | Aluminum Anodizers Council | |
| AACA | Architects Accreditation Council of Australia | |
| AACE | Architecture Advanced Concepts and Engineering | |
| AACE | Art Architecture Construction and Engineering | |
| AAD | Architecture And Design | |
| AADL | Architecture Analysis & Design Language | |
| AADPS | Algorithmic Architecture Data Processing System | |
| AAESDA | Association of Architects, Engineers, Surveyors, and Draughtsmen of Australia | |
| AAESDA | Association of Architects Engineers Surveyors and Draughtsmen of Australia | |
| AAESDA | Association of Architects Engineers Surveyors and Draftsmen of Australia | |
