| Abbreviation | Definition |
|---|---|
| SMY | Santa Marina Yachts |
| SMYB | Saint Malo Yachts Broker |
| SRD | Schulz Reverse Deadline |
| SSY | South Seas Yachting |
| SSY | Super Sport Yacht |
| SSY | Swedish Steel Yachts |
| SWYB | South West Yacht Brokers |
| 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. |
| SYC | Syracuse Yacht Club |
| SYH | Suffolk Yacht Harbour |
| TBYH | Tyrrel Bay Yacht Haulout |
| TINY | This Is Not a Yacht |
| TLYC | Torch Lake Yacht Club |
| TSS | Tampa Sailing Squadron |