| Acronym | Definition |
|---|
| SSDD | Subsystem Design Description |
| SSDD | System Segment Design Document |
| SSDD | Same Stuff Different Day (polite form) |
| SSDD | System/Software Design Document (National Interagency Resource Ordering and Status System) |
| SSDD | Sunshine Daydream |
| SSDD | System/Segment Design Document |
| SSDD | System/Subsystem Design Description (MIL-STD-498) |
| SSDD | Segment Design Document |
| SSDD | Single Side Double Density (5.25" floppy disk) |
| SSDD | System/Segment Design Document (DoD-STD-2167a) |
| SSDD | Source Selection Decision Document |
| SSDD | Super Sloppy Double Dare (TV show) |
| SSDD | System Simulation and Development Directorate (US Army AMRDEC, RDECOM) |