| Abbreviation | Definition |
|---|---|
| C# | Cohen Number |
| CAC | Certified Acceptance Corporation |
| CAD | Collectors And Dealers |
| CBC | Coin Branch and Cut |
| CBC | COIN or Branch and Cut |
| CC | Carson City, Nevada (mint mark on United States coins) |
| CCE | Certified Coin Exchange |
| CCH | Coin Cell Holder |
| CDC | Certified Diamond Coin |
| CDN | Coin Dealer Newsletter |
| CHRE | Coin Hoards of the Roman Empire |
| CHRR | Coin Hoards of the Roman Republic |
| CICF | Chicago International Coin Fair |
| CLR | Coincident Linear Reference |
| CMC | Coin Market Cap |
| CMD | Coin Market Daddy |
| CMM# | Cohen, Munson, Munde Number |
| CN | Copper Nickel coin |
| CNAC | Coin National Analysis Center |
| CNT | Coins N Things |