Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym SSSR is...

SSSR is

Soyuz Sovietskiy Sotsialisticheskiy Respublik

More Meanings For SSSR:

Soyuz Sovietskich Socialisticeskich Respublik
Smallest Set Of Smallest Rings
Small Signal Stability Region
Support To Security Sector Reform
Soyuz Sovietskiy Sotsialisticheskiy Respublik

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