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USR
+/--- Universal Space Rectangular
+/--- User-to-User Information
+/--- unit status report
AcroLexic: Dictionary of Acronyms and Abbreviations contains 4 more definitions of “USR”.
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See also

Acronym Definitions
FUSRAP 3
CUSRPG 2
USRA 2
USRT 1
USRADS 1