| Subject | English | German |
| phys. | Hadron-Elektron-Ringanlage | Hadron-Elektron-Ringanlage (hadron-electron circular accelerator) |
| phys. | Positron-Elektron-Tandem-Ringanlage | Positron-Elektron-Tandem-Ringanlage (positron-electron tandem cyclic accelerator) |
| phys. | proton-elektron mass ratio | Massenverhältnis Proton-Elektron |