| Subject | English | German |
| meas.inst. | C-battery | Gitterbatterie |
| commun. | C-channel | C-Kanal (control channel; ISDN) |
| opt. | C-factor | C-Faktor (ratio of the flight height to the smallest contour interval accurately plottable) |
| meas.inst. | C-voltage | Gitterspannung |