Rb is the symbol for the element, rubidium.
RB ???
RB as it is at this time
Rb
85.4678 is the atomic weight of Rb.
RB means random boner
The oxidation number of Rb is 1.
Tennessee Titans RB - Chris Johnson
Rb (rubidium) is a metal.
Their 1st String RB is Tim Hightower
Rb
RB Leipzig was created on 2009-05-19.