| Acronym | Definition |
|---|
| RRTA➣Railroad Retirement Tax Act (IRS; similar to Social Security) |
| RRTA➣Red Rose Transit Authority |
| RRTA➣Reversed Ray Tracing Algorithm |
| RRTA➣Rapid Response for Technical Assistance (US DHHS) |
| RRTA➣Rolling River Teachers' Association (Manitoba, Canada) |