| Abbreviation | Meaning |
| COA | Certificate of Authenticity |
| IC | Index Card |
| IP | An autograph obtained in person |
| PP | Preprint - photo of a celebrity that was signed once and then reproduced with the signature already on it. |
| RTS | Return To Sender |
| SAE | Self-addressed envelope |
| SASE | Self-addressed, stamped envelope |
| SC | Signed card |
| SIC | Signed Index Card |
| SPC | Signed Postcard |
| TTM | Through The Mail |