| Subject | English | Danish |
| gen. | reference line | referencelinje |
| tech. | reference line | nullinje |
| gen. | reference line | observationslinje |
| commun., IT | reference line unit | referenceledningsenhed |
| gen. | torso reference line | torsoreferencelinje |
| transp., tech. | torso-arm reference line | torsoens armreferencelinje |
| comp., MS | wall reference line | referencelinje til væg (The line that extends from the wall begin point to the wall endpoint. Although the wall reference line is typically centered on the wall or aligned with one edge of the wall, you can locate it any distance you want from the wall) |