What Russian word became associated with of as part program in the late

The Russian word that became associated with operating systems in the late 20th century is "операционная система" (pronounced "operatsionnaya sistema").

This translates literally to "operational system" and it became the standard term for referring to operating systems in Russia and many other former Soviet republics.

While the term "операционная система" is still used today, the word "ОС" (pronounced "OS"), which is a shortened form of "операционная система," is also widely used as a more casual and concise way to refer to operating systems.