| Subject | English | Bulgarian |
| commun. | double tone multiple frequency | тонално номеронабиране |
| comp., MS | dual-tone multiple-frequency | сигнализиране с двучестотни тонове (The signaling system used in telephones with touchtone keypads, in which each digit is associated with two specific frequencies) |
| construct. | multiple-frequency vibrator | високочестотен вибратор |