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RB
++++- red border
+++-- Rubidium
/---- reactor building
AcroLexic: Dictionary of Acronyms and Abbreviations contains 13 more definitions of “RB”.
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See also

Acronym Definitions
PRB 15
RBS 14
IRB 14
MRB 13
SRB 12
DRB 10
CRB 9
RBI 8
RBA 8
ARB 8
RBC 8
RBE 7
ERB 7
FRB 7
TRB 6
BRB 6
RBF 6
ORB 5
RBP 5
RRB 5