SLI
- SAP Labs India
- SLI Systems
- SLI battery
- Safe Load Indicator
- Scalable Link Interface
- Scan-Line Interleave
- Sensory Logical Introvert
- Service level indicator
- Somerset Light Infantry
- Southwestern Louisiana Institute
- Space Launch Initiative
- Specific language impairment
- Street light interference
- Swiss Leader Index
- Sylvania Lighting International
- Symmetric level-index arithmetic