| Abbreviation | Definition |
|---|---|
| BT1 | Boiler Technician Petty Officer 1st Class |
| BT1 | Boilerman Petty Officer 1st Class |
| BT2 | Boiler Technician Petty Officer 2nd Class |
| BT2 | Boilerman Petty Officer 2nd Class |
| BT3 | Boiler Technician Petty Officer 3rd Class |
| BT3 | Boilerman Petty Officer 3rd Class |
| BTC | Boiler Technician Chief Petty Officer |
| BTC | Boilerman Chief Petty Officer |
| BTCM | Boiler Technician Master Chief Petty Officer |
| BTCS | Boiler Technician Senior Chief Petty Officer |
| BTFA | Boiler Technician Fireman Apprentice |
| BTFA | Boilerman Fireman Apprentice |
| BTFN | Boiler Technician Fireman |
| BTFN | Boilerman Fireman |
| BTFR | Boiler Technician Fireman Recruit |
| BTFR | Boilerman Fireman Recruit |
| BTG1 | Boilerman (shipboard) Petty Officer 1st Class |
| BTG2 | Boilerman (shipboard) Petty Officer 2nd Class |
| BTG3 | Boilerman (shipboard) Petty Officer 3rd Class |
| BTGC | Boilerman (shipboard) Chief Petty Officer |