What does USSR stand for?

What does USSR mean?

USSR	Union of Soviet Socialist Republics Governmental » US Government
USSR	Union of Soviet Socialist Republics Regional » Countries
USSR	Union of Soviet Socialist Republics Governmental
USSR	Union of Soviet Socialist Republics Governmental » Military
USSR	Uninterrupted Sustained Silent Reading Academic & Science » Universities
USSR	Uninterrupted Sustained Silent Reading Community » Educational
USSR	Ultra Simple Skirmish Rules Community » Sports
USSR	United States Smoking Repression Community » Educational
USSR	Uninterrupted Silent Sustained Reading Miscellaneous » Unclassified
USSR	Under Sorrowful Supervision Relationship Miscellaneous » Funnies
USSR	The Underground Society Of Secret Rythm Miscellaneous » Unclassified
USSR	United Stitching And Sewing Ring Miscellaneous » Unclassified
USSR	Union of Socialist Soviet Republics Governmental » FBI Files

Soviet Union, Russia, Union of Soviet Socialist Republics, USSR(noun): a former communist country in eastern Europe and northern Asia; established in 1922; included Russia and 14 other soviet socialist republics (Ukraine and Byelorussia and others); officially dissolved 31 December 1991