| Subject | Italian | English |
| gen. | conformità a Open Systems | open systems-conformity |
| IT | Open Systems Foundation | Open Software Foundation |
| comp., MS | Open Systems Interconnection | Open Systems Interconnection model (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) |