| Abbreviation | Definition |
|---|---|
| SWORD | South Western Ontario Regional Dojos |
| SWP | Skill With Prizes |
| SWQ | Star Wars Quake |
| SWRT | Subaru World Rally Team |
| SWS | Side Wall Stun |
| SWS | Star Wars Simulation |
| SX | Supercross |
| SXD | Sheffield Xercise Directory |
| SXN | Section |
| SXX | Spades Unknown |
| SYA | Southwestern Youth Association Soccer |
| SYA | Sy Young Award |
| SYB | Springfield Youth Baseball |
| SYC | Sandringham Yacht Club |
| SYC | Sarasota Yacht Club |
| SYC | Sausalito Yacht Club |
| SYC | Shawnee Yacht Club |
| SYC | Squantum Yacht Club (MA) |
| SYC | Steinberger Yacht Club, e.V. |
| SYC | Sylter Yacht Club, e.V. |