| Subject | English | Icelandic |
| math. | R-estimator | R metill |
| math. | R-process | R ferli |
| comp., MS | R-squared value | R-kvaðratgildi (A number from 0 to 1 that reveals how closely the estimated values for the trendline correspond to your actual data. A trendline is most reliable when its R-squared value is at or near 1) |
| math. | R-technique | R-tækni |