'Tb' used in million biggest domains list by Alexa.com:
outbrain.comjustbeenpaid.com
bestbuy.com
eventbrite.com
bestblackhatforum.com
breitbart.com
'Tb' used in other domains:
springcrestburtons.comartbymachinery.com
siamsportbooks.com
rochesterfootbag.com
frantic-nutbush.com
kennettbrewfest.com
Statistical data
"tb" has the frequency of use of 0.0005% on city-data.com forum
"Tb" has the frequency of use of 0.0003% on en.wikipedia.org.
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