| Abbreviation | Definition |
|---|---|
| SCU | Signal Control Unit |
| SCW | Sima ColorWriter |
| SD | SAN (Storage Area Network) Disk |
| SD | Scan Disk |
| SD | Small Dual in-line package |
| SD | Smart Disc |
| SD | Smart Drive |
| SD | Spin Down |
| SDA | Semi-Digital Amplifier |
| SDA | Smartphone Digital Assistant |
| SDC | Single Board Computer |
| SDCP | Shared Diagnostic Control Panel |
| SDDS | Sony Dynamic Digital Sound |
| SDF | Standard Delay Format |
| SDF | Switch Disconnector Fuse |
| SDF | System Data Format |
| SDFF | Semi-Dynamic Flip-Flop |
| SDH | Software Defined Hardware |
| SDHC | Secure Digital High Capacity |
| SDI | Serial Data Input |