| Abbreviation | Definition |
|---|---|
| SCU | Service and Cooling Umbilical |
| SCU | Signal Conditioning Unit |
| SCU | Signal Control Unit |
| SCU | System Control Unit |
| SCUB | Satellite Central Utility Building |
| SCV | Space Construction Vehicle |
| SD | Scaling and Display |
| SD | Small Dual in-line package |
| SD | Smoke Detector |
| SD | Solar Dynamic |
| SD | Space Division |
| SD | Spare Disposition |
| SD | Specification Document |
| SD | Subscale Demonstrator |
| SD | Supplier Documentation |
| SD/FS | Smoke Detector/Fire Suppression |
| SD/YVV | SD/Launch Base Division |
| SDA | Shaft Drive Axis |
| SDA | Space Data Association |
| SDAF | SRB (Solid Rocket Booster) Dis-Assembly Facility |