| Acronym | Definition |
|---|
| R4R➣Resources for Rethinking (Learning for a Sustainable Future) |
| R4R➣Referral for Referral |
| R4R➣Ready 4 Racing (online games team) |
| R4R➣Ready 4 Repo |
| R4R➣Ready for Reproduction |
| R4R➣Ropings for Ropers (Temecula, CA team roping club) |
| R4R➣Robots for Robots |
| R4R➣Rides4Rides.com |