| Acronym | Sense | Language | Topics |
|---|---|---|---|
| SL | Second Life | In English | → Entertainment |
| SL | Sairaalaliitto | In Finnish | |
| SL | Sea Level | In English | → Marine research, oceanography |
| SL | Shelf Life | In English | |
| SL | Sound Level | In English | |
| SL | Space Laboratory | In English | → Research institutes → Astronautics |
| SL | Space Launch | In English | → Astronautics |
| SL | Spacelab | In English | → Astronautics |