| Abbreviation | Definition |
|---|---|
| RN | Renumbering |
| RN | Response Numerical |
| RN | Result Number |
| RN | Roman Numeral |
| RN | Rule Name |
| RND | Round |
| RNG | Random Number Generator |
| RNG | Range |
| RNN | Reverse Nearest Neighbor |
| ROC | Radius Of Curvature |
| ROC | Region Of Convergence |
| ROIF | Reduced Order Information Filter |
| ROIL | Reverse Opt In List |
| ROM | Rough Order of Magnitude |
| ROR | Rejection of Outliers by Rotation |
| RORI | Rule Out, Rule In |
| RPDA | Robust Partial Discriminant Analysis |
| RPI | Reverse Puiseux Inequalities |
| RPN | Reverse Polish Notation |
| RPT | Relative Prime Transform |