| Abbreviation | Definition |
|---|---|
| SBA | Susan B. Anthony dollar coin |
| SCBI | Sylloge of Coins of the British Isles |
| SCD | Small Coin Depot |
| SCO | Seleucid Coins Online |
| SCPM | Southern Coins and Precious Metals |
| SCPM | Southern Coins Precious Metals |
| SCTG | Signed Coin Through Glass |
| SD | Small Date |
| SEGS | Sovereign Entities Grading Service |
| SGE | Sehr Gut Erhalten (German coin grade equivalent to Very Good) |
| SLIC | Sea Lion Incentive Coin |
| SLQ | Standing Liberty Quarter |
| SMS | Special Mint Set |
| SMV | Standard Mint Value |
| SNLQ | Single in Lieu of Quarters |
| SP | Specimen |
| SPL | Splendido (Italian coin grade equivalent to Extremely Fine) |
| SS | Sehr Schon (German coin grade equivalent to Very Fine) |
| STGL | StempelGlanz (German coin grade equivalent to Uncirculated) |
| SUP | Superbe (French coin grade equivalent to Extremely Fine) |