| Subject | English | Bulgarian |
| IT, tech. | layer 3 | слой 3 |
| IT, tech. | layer 3 | мрежов слой |
| comp., MS | MPEG Audio Layer-3 | аудио слой 3 на MPEG (A digital audio coding scheme used to distribute recorded music over the Internet. MP3 shrinks the size of an audio file by a factor of 10 to 12 without degrading the quality (CD-recording level) of the sound) |