| Abbreviation | Definition |
|---|---|
| SLDI | Sector List Drop Interval |
| SLE | Seletar Expressway |
| SLE | Sweet Luxury Edition |
| SLED | Sentry Longitudinal Energy Dissipater |
| SLEV | Super Low Emissions Vehicle |
| SLEX | Southern Luzon Expressway |
| SLF | Self Loading Freight |
| SLK | Sport Licht Kurz |
| SLK | Sportlich Leicht And Kompakt |
| SLM | Sound Level Measuring |
| SLMM | Simultaneous compass Locator at Middle Marker |
| SLMS | Sound Level Measuring Set |
| SLP | Street Legal Performance |
| SLR | Sporty, Light, And Racing |
| SLRTC | Sierra Leone Road Transportation Corporation |
| SLS | Self-Levelling Suspension |
| SLS | Seville Luxury Sedan |
| SLS | Speed Limmit Sign |
| SLS | Super Light and Sport |
| SLSDC | Saint Lawrence Seaway Development Corporation |