| Subject | English | Portuguese |
| comp., MS | multiple activation key | chave de ativação múltipla (A volume license key that is used for one-time activation with activation services that are hosted by Microsoft) |
| mech.eng. | multiple keys | chavetas múltiplas |
| mech.eng. | multiple keys | escateis múltiplas |
| transp., mech.eng. | multiple keys | estria |
| el. | multiple phase shift keying | PSK m-valente |