| Abbreviation | Definition |
|---|---|
| IC | Ignorant Counterfeit |
| ICGS | Independent Coin Grading Service |
| ICO | itial Coin Offering |
| ICO | Initial Coin Offering |
| ICOO | Initial Coin Offering OpenLedger |
| IHC | Indian Head Cent |
| IKE | Eisenhower Dollar coin |
| J# | Judd Number |
| JR# | John Reich Number |
| KCN | Koles Coin News |
| KM# | Krause and Mishler Number |
| L-1 | Lousy 1 (coin grade) |
| L-2 | Lousy 2 (coin grade) |
| LBRC | Larry Briggs Rare Coins |
| LBTC | Lightning Bitcoin |
| LD | Large Date |
| LEGIT | Legitcoin |
| LINC | Lincoln Cent |
| LM# | Logan-Mccloskey Number |
| LUC | Level Up Coin |