| Abbreviation | Definition |
|---|---|
| DCS | Digital Command System |
| DCS | Display and Control System |
| DCS | Document Control System |
| DCS | Dual Checkout Station |
| DCSI | Data and Control Signal Interface |
| DCSP | Digital Control Signal Processor |
| DCSU | Digital Computer Switching Unit |
| DCU | Digital Computer Unit |
| DCU | Display and Control Unit |
| DCV | Direct Current Volts |
| DD | Data Depository |
| DD | Data Display |
| DD | Decoder Driver |
| DD | Dedicated Display |
| DD | Directives Documentation |
| DD | Mechanical and Facilities Engineering Directorate, Kennedy Space Center |
| DD&CS | Dedicated Display and Control Subsystem |
| DD/HH:MM:SS | Day/Hour:Minute:Second |
| DDA | Data Delivery Acknowledgement |
| DDA | Digital Differential Analyzer |