| Subject | English | Russian |
| progr. | fallback default language for the system UI | резервный язык интерфейса пользователя по умолчанию (ssn) |
| comp., MS | fallback language | базовый язык (The base language that appears when a string has not been localized into a partially localized language) |
| comp., MS | ultimate fallback language | встроенный язык (A final fallback language independent of user and system preferences. Resources for this language may either be built into the language-neutral portable executable, or otherwise guaranteed (through the installation process) to be always available) |