| Abbreviation | Definition |
|---|---|
| PR | Proof |
| PUC | Pourcoin |
| QH | Quick Hundreds |
| QSB | Quality Silver Bullion |
| R | Rarity |
| RB | Red-Brown |
| RCC | Rec.Collecting.Coins |
| RD | Red |
| RIC | Roman Imperial Coinage |
| RMC | Russian Miner Coin |
| RNS | Royal Numismatic Society |
| RPC | Roman Provincial Coinage |
| RPD | Repunched Date |
| RPM | Repunched Mintmark |
| RSC | Roman Silver Coinage |
| S | San Francisco, California (mint mark on United States coins) |
| S | Schon (German coin grade equivalent to Fine) |
| S# | Sheldon Number |
| S# | Snow Number |
| SAE | Silver American Eagle |