| Subject | English | German |
| commun. | non return to zero mark code | Wechselschrift (PCM) |
| commun. | non return to zero change code | Richtungsschrift (PCM) |
| commun. | non return to zero inverted NRZI code | Wechselschrift (PCM) |
| comp., MS | return code | Rückgabecode (In programming, a code that is used to report the outcome of a procedure or to influence subsequent events when a routine or process terminates (returns) and passes control of the system to another routine. Return codes can, for example, indicate whether an operation was successful or not and can thus be used to determine what is to be done next) |
| tech. | return code | Rückkehrcode |
| tech. | return code | Rückgabecode |
| tech. | return-to-zero code | Rueckkehr-zu-Null Kode |