| Abbreviation | Definition |
|---|---|
| SNLF | Special Naval Landing Forces |
| SNNF | Sanatório Naval de Nova Friburgo |
| SNSN | Standard Navy Stock Number |
| SNTC | System for Naval Target Control |
| SO1 | narman Petty Officer 1st Class |
| SO1 | Sonarman Petty Officer 1st Class |
| SO2 | narman Petty Officer 2nd Class |
| SO2 | Sonarman Petty Officer 2nd Class |
| SO3 | narman Petty Officer 3rd Class |
| SO3 | Sonarman Petty Officer 3rd Class |
| SOC | narman Chief Petty Officer |
| SOC | Sonarman Chief Petty Officer |
| SOG1 | onarman (sonarman) Petty Officer 1st Class |
| SOG1 | Sonarman (sonarman) Petty Officer 1st Class |
| SOG2 | onarman (sonarman) Petty Officer 2nd Class |
| SOG2 | Sonarman (sonarman) Petty Officer 2nd Class |
| SOG3 | onarman (sonarman) Petty Officer 3rd Class |
| SOG3 | Sonarman (sonarman) Petty Officer 3rd Class |
| SOGC | onarman (sonarman) Chief Petty Officer |
| SOGC | Sonarman (sonarman) Chief Petty Officer |