| Abbreviation | Definition |
|---|---|
| RTK | Romance of Three Kingdoms |
| RUR | Rossum's Universal Robots |
| RVR | Realm Vs. Realm |
| RWO | Regulator World Order |
| SA | Spooky Apparition |
| SAF | Skulls And Flames |
| SAGE | Sentient Arcanum Guide Explorer |
| SAN | Star Alliance Navy |
| SANDERS | Systematic Android Network Diode Energy Rocket System |
| SAS | Space Aggressor Squadron |
| SBH | Starbase Houston |
| SBP | Super Basher Platinum |
| SCA | Society for Contemporary Anachronism |
| SCD | Slowly Changing Dimension |
| SCE | Starfleet Corps of Engineers |
| SCIFI | Science Fiction |
| SCK | Subhuman Combat Klan |
| SCP | Secure, Contain, Protect |
| SCR | Starfleet Command Regulation |
| SCROD | School Cosmic Ray Outreach Detector |