| Abbreviation | Definition |
|---|---|
| COA | Certificate Of Authentication |
| COLB | Coin-Operated-Locker Babies |
| COPT | Coin Operated Pay Telephone |
| COTVM | coin operated Ticket Vending Machines |
| CPMC | Coin Phone Management Company |
| CRV | Collectors Rating Value |
| CS | Counter Strike |
| CSDG | California Small Denomination Gold |
| CV | Catalog Value |
| CW | Coin World |
| D | Dahlonega, Georgia (mint mark on United States gold coins) |
| D | Denver, Colorado (mint mark on United States coins) |
| DAICO | Decentralized Anonymous Initial Coin Offering |
| DAICO | Decentralized Autonomous Initial Coin Offerings |
| DC | Deep Cameo |
| DD | Doubled-Die |
| DDO | Doubled Die Obverse |
| DDR | Doubled Die Reverse |
| DEC | Darico Ecosystem Coin |
| DLRC | David Lawrence Rare Coins |