'Rb' used in million biggest domains list by Alexa.com:
forbes.commycalendarbook.com
turbobit.net
mybrowserbar.com
discoverbing.com
urbandictionary.com
'Rb' used in other domains:
skarborneng.comcurbsfast.com
marble-handicrafts.com
gregorbossert.com
cleververbunden.com
clever-verbunden.com
Statistical data
"rb" has the frequency of use of 0.0004% on city-data.com forum
"Rb" has the frequency of use of 0.0004% on en.wikipedia.org.
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