| Subject | English | Polish |
| semicond. | bidirectional diode thyristor | diak |
| semicond. | bidirectional diode thyristor | tyrystor diodowy dwukierunkowy |
| comp., MS | bidirectional prediction | przewidywanie dwukierunkowe (A compression technique in which some images are predicted from the picture immediately preceding and following the image) |
| semicond. | bidirectional transistor | tranzystor dwukierunkowy |
| semicond. | bidirectional triode thyristor | triak |
| semicond. | bidirectional triode thyristor | tyrystor triodowy dwukierunkowy |
| el. | bidirectional ventilation unit | dwukierunkowy nawiewno–wyciągowy system wentylacyjny |