The abbreviation stands for QB:

  • Quarterback is a position in American football
  • Quebecair, former Canadian airline ( IATA code )
  • Quick Basic, a programming language
  • Queensbridge, a hamlet in New York City
  • Queen's Bench, a court in the English legal system

QB as distinguishing signs on license plate:

  • Belgium: Trailer
  • Disambiguation
  • Abbreviation