PRE 1PO🇺🇸 AmericafunnycleverbusinesstechnerdyPre IPO, a car bought at a startup before the company went public. Funny!
IBM1620🇺🇸 AmericanerdycomputersfunnyThe IBM 1620 was an early scientific computer from 1959. Maybe they work for IBM?
VI4EVER🇺🇸 AmericanerdysoftwarenameprogrammerVi forever - maybe referring to the text editor program "Vi"? It could also be someone's name.
DP/DT=?🇺🇸 Americamathnerdy'dP / dt' is defined as the rate of change of pressure with respect to time