| Abbreviation | Definition |
|---|---|
| SK | Specialized Knowledge |
| SKE | Schwarzchild Kinematical Explorer |
| SKIRT | Shuttle Kientic Infrared Test |
| SKO | Superior Kerosene Oil |
| SKU | Stock Known Unit |
| SL | Save Layout |
| SL | Speak Language |
| SL | Source Language |
| SL | Short Length |
| SL-D | German Spacelab |
| SL-J | Japanese Spacelab |
| SL-SS | Spacelab Subsystems |
| SL-SSS | Spacelab Subsystem(s) Segment |
| SLA | Senior Laboratory Assistant |
| SLA | Shift Left Arithmetic |
| SLA | Support and Logistics Areas |
| SLA | Super Light Ablator |
| SLA | Shuttle Laser Altimeter |
| SLA | Soluble Liver Antigen |
| SLAC | ERNO Spacelab Product Assurance Department |
| SLAHTS | Stanford Linear Accelerator Center |
| SLAK | Stowage List and Hardware Tracking System |
| SLAM | Software, Languages, Analysis, And Modeling |
| SLAM | Spacelab Late Access Kit |
| SLAR | Side Load Arrest Mechanism |
| SLAT | Second - Level Address Translation |
| SLBM | Sea-Launch Ballistic Missile |
| SLC | School Leaving Certificate |
| SLC | Side Looking Airborne Radar |
| SLC | Space Launch Complex |
| SLC | Shuttle Launch Complex |
| SLCA | ERNO Spacelab Project Control |
| SLCC | ERNO Spacelab Contract Administration |
| SLCC | State Level Coordination Committee |
| SLCL | ERNO Spacelab Configuration Management |
| SLD | Source Level Definition |
| SLD | Service Level Director |
| SLD | Shop/Lab Configuration Layout |
| SLDT | Store Local Descriptor Table |
| SLE | Systemic Lupus Erythematosus |
| SLEMU | ERNO Spacelab Engineering |
| SLET | State Level Eligibility Test |
| SLF | Spacelab Engineering Model Unit |
| SLF | Shuttle Landing Facility |
| SLFP | Sri Lanka Freedom Party |
| SLG | Slide Gate Operator |
| SLI | Set Link Information |
| SLI | Suppress Length Indication |
| SLI | System Load and Initialization |
| SLI | Shuttle landing facility (KSC) |