| Subject | English | Bulgarian |
| environ. | monitoring system A coordinated body of sensory and communications devices that observes, detects or records the outputs or operations of any natural or artificial system in order to construct a history or future of events | система за мониторинг |
| transp., mil., grnd.forc. | on-board isolation resistance monitoring system | бордова система за следене на изолационното съпротивление |