What does SL stand for in geocaching?

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Tags

1. #cache
2. #various
3. #indicate
4. #geocacher
5. #grabbing
6. #acronyms
7. #nothing
8. #tnlnsl
9. #combined
10. #geocaching
11. #together
12. #signed
13. #culture
14. #neither
15. #integrated
16. #dropping
17. #often
18. #anything