| Subject | English | Estonian |
| tech., el. | crash protection system | avarii ohutussüsteem |
| coal., mech.eng. | overpressure protection system | ülerõhukaitsesüsteem |
| environ. | protection system A series of procedures and devices designed to preserve people, property or the environment from injury or harm | kaitsesüsteem |
| transp. | side underrun protection system | külgmine allasõidutõke |
| social.sc. | social protection system | sotsiaalkaitsesüsteem |
| environ. | stationary fire protection system | paikne tuletõrjesüsteem |