'Pb' used in million biggest domains list by Alexa.com:
dropbox.compbskids.org
pbs.org
shopbop.com
mapbar.com
wpbeginner.com
'Pb' used in other domains:
elizabethhepburn.comspbaexchange.com
pb-global.com
joinrtripbook.com
scrapbookartisans.com
spbiblechapel.com
Statistical data
"pb" has the frequency of use of 0.0007% on city-data.com forum
"Pb" has the frequency of use of 0.0002% on en.wikipedia.org.
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