| Abbreviation | Definition |
|---|---|
| SL | Specification Limit |
| SLAM | Stereo Limiter And Microphone Pre-amplifier |
| SLAP | Staggered Layered Audio Protection |
| SLC | Single Layer Coating |
| SLC | Sound Level Conversion |
| SLC | Speaker Lead Compensator |
| SLC | Surface Laminar Circuit |
| SLCD | Super Liquid Crystal Display |
| SLCO | Sapphire Loaded Cavity Oscillator |
| SLD | Strong Lattice Deformation |
| SLD | Super Low Density |
| SLD | Superluminescent Diode |
| SLE | Super Leading Edge |
| SLEME | Sri Lanka Electrical and Mechanical Engineers |
| SLER | Single Line Earth Return |
| SLIC | Standard-function Linear Integrated Circuit |
| SLL | Side Lobe Level |
| SLM | Sound Level Meter |
| SLM | Spatial Light Modulator |
| SLOC | Source Lines Of Code |