| Abbreviation | Definition |
|---|---|
| DD | Double Density (floppy disk) |
| DD-50 | 50-pin D-SUB (series D subminiature) connector |
| DDA | Digital Differential Analyzer |
| DDB | Data Drain Bracelet |
| DDC | Direct Digital Control |
| DDC | Display Data Channel |
| DDC | Dynamic Dimple Composite |
| DDD | Dot Density Display |
| DDDI | Dual-fiber Distributed Data Interface |
| DDF | Disk Data Format |
| DDR | Digital Disk Recorder |
| DDR | Double Data Rate |
| DDR | Double Density RAM (Random-Access Memory) |
| DDR3 | Double Data Rate 3 |
| DDRRAM | Double Data-Rate Random-Access Memory |
| DDSD | Dual Sided Disk Drive |
| DDST | Double Disk Synergy Test |
| DE | Digital Environment |
| DE-9 | 9-pin D-SUB (series D subminiature) connector |
| DEA | Digital Entertainment Array |