| Subject | English | Lithuanian |
| comp., MS | Mac OS | MAC OS (The name given to the Macintosh operating system, beginning with version 7.5 in September 1994, when Apple started licensing the software to other computer manufacturers) |
| comp. | mobile OS | mobiliųjų įrenginių operacinė sistema |
| gen. | mobile OS | mobilioji operacinė sistema |
| comp., MS | Windows OS Loader | "Windows" OS įkelties programa (A Boot Configuration Data (BCD) application object) |