| Abbreviation | Definition |
|---|---|
| GC | Gold Collector |
| GCCH | Global Coin Community Help |
| GCR | Global Coin Research |
| GD | Golden Dollar |
| GE | Gut Erhalten (German coin grade equivalent to Good) |
| GES | Gering Erhalten Schlecht (German coin grade equivalent to Almost Good) |
| GML | Gold Maple Leaf |
| GMM | Gallery Mint Museum |
| GMS | Grant Management System |
| GP | Gold Piece |
| GROAT | The groat was a unit of currency in England in the Middle Ages. It was a fourpenny piece. |
| GS | German Silver |
| GSCS | Golden State Coin Show |
| GTC | Global Tour Coin |
| H | Heads |
| HCC | Happy Creator Coin |
| HFC | High Fidelity Coins |
| HL | High Luster |
| HLRC | Harry Laibstain Rare Coins |
| HVR | High Velocity Re-strike |