Question

what is the meaning of USSR

Answer 1

USSR is an abbreviation for Union of Soviet Socialist Republics. This title is also sometimes shortened to the Soviet Union

Answer 2

$\textbf{\huge\underline{\underline\red{Answer} : - }} \\ \\ \bold{The \: full \: form \: of \: USSR \: is} \\ \\ \bold {\purple{Union \: of \: Soviet \: Socialist \: }} \\ \bold {\purple{Republics} }\\ \\ \\ \\ \textbf{ \underline\red{ i \: hope \: it \: helps \: you.}}$