| Abbreviation | Definition |
|---|---|
| CWNP | Certified Wireless Networking Professional |
| CYPN | Chinese Young Professionals Networking |
| CYS | Cite Your Sources |
| D | Data |
| DACCS | Digital Access Cross Connect Switch |
| DACS | Danbury Area Computer |
| DAE | Digital Audio Engine |
| DAF | Data Authorization Form |
| DAI | Data Access Interface |
| DAL | Data Access Layer |
| DAMA | Demand Assigned Multiple Access |
| DAN | Data Acquisition Node |
| DAN | Dial Access Network |
| DANTE | Digital Audio Networking Through Ethernet |
| DAR | Dual Analog Route |
| DARPAN | Development Advocacy Resource Planning Awareness and Networking |
| DART | Data Access Real Time |
| DAS | Direct Attached Storage |
| DAS | Distributed Annotation System |
| DAS | Distributed Application Services |