| Subject | English | Romanian |
| construct. | open construction system | sistem de construcție deschis |
| construct. | open heat-supply system | sistem de încălzire cu racordare directă |
| construct. | open steam-heating system | sistem de încălzire cu abur cu circuit deschis |
| construct. | open system of typification | sistem de tipizare deschis |
| comp., MS | Open Systems Interconnection model | Interconectare sisteme deschise (A networking model introduced by the International Organization for Standardization (ISO) to promote multi-vendor interoperability. OSI is a seven-layered conceptual model consisting of the application, presentation, session, transport, network, data-link, and physical layers) |
| commun., comp. | open systems interconnection reference model | model de referință OSI |
| commun., comp. | open systems interconnection reference model | model de interconectare a sistemelor deschise |
| gen. | open systems interconnection reference model | model OSI |
| vent. | open-type exhausting system | dispozitiv deschis de aspirație |