What does R mean on Reddit?

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Tags

1. #reddit
2. #stood
3. #implemented
4. #short
5. #meanings
6. #double
7. #having
8. #would
9. #admins
10. #represented
11. #nomenclature
12. #without
13. #basically
14. #specific
15. #originally
16. #subreddits
17. #which
18. #discussing
19. #terms
20. #explain