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Some ideas

\pb

Lead, the metallic element whose abbreviation is based on the latin plumbum

Petabit (Pb), a unit of information used, for example, to quantify computer memory or storage capacity

PB (pistol), a Soviet silenced pistol intended for army reconnaissance groups and the KGB

P.B.
1. acronym for Perv Boy or Pervert Boy

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Never mind I see KitJ’s reply. Lol