| Abbreviation | Definition |
|---|---|
| SMV | Slow Moving Vehicle |
| SMV | smart moving vehicles |
| SMV | Super Mileage Vehicle |
| SMVP | Senior Management Vehicle Program |
| SNA | John Wayne Airport - Orange County |
| SNCB | Société Nationale des Chemins de fer Belges |
| SNCR | Selective Non Catalytic Reduction |
| SNEV | Super Nova Electric Vehicle |
| SNG | Synthetic Natural Gas |
| SNIC | SNow and Ice Control |
| SNLV | Strategic Nuclear Launch Vehicle |
| SNPRM | Supplemental Notice of Proposed Rulemaking |
| SNT | Special Needs Transportation |
| SNV | Satellite News Vehicle |
| SO | Straight On |
| SO2 | Sulfur Dioxide |
| SOA | Spring Over Axle |
| SOB | Souls On Board |
| SOB | Step On Brake |
| SOBO | Set-Out a Bad Order |