| Abbreviation | Definition |
|---|---|
| SCS | Space Control Ship |
| SCY | Space Cruiser Yamato |
| SD | Shadow Dale |
| SD | Star Delta |
| SDF | Super-Dimensional Fortress |
| SDL | Sam's Draconic Lizard |
| SDPS | Super Dooper Pooper Scooper |
| SDR | Sony Dream Robot |
| SEAN | Synthetic Electronic Assassination Neohuman |
| SEAR | Superultramodern Ethical Aesthetic Relativism |
| SEBS | Surface Energy Balance System |
| SETI | The Search For Extra Terestrial Inteligence |
| SF | Science Fiction |
| SFA | Star Fleet Academy |
| SFA | Star Fleet Adventures |
| SFB | StarFleet Battles |
| SFBC | Science Fiction Book Club |
| SFC | Star Fleet Command |
| SFCD | Science Fiction Club Deutschland |
| SFD | Science Fiction Dork |