NB

The letters NB or Nb can stand for:

Nb – the symbol for the chemical element Niobium
Norwegian Bokmål language (ISO 639 alpha-2, nb)
NB – the Canadian province of New Brunswick (Canada Post provincial abbreviation)
NB, n.b., please note – the Latin phrase Nota Bene (See List of Latin phrases#N)
NB is the IATA code for Sterling Airlines
NB are the initials of Nationale Block (National Block), a German neo-Nazi group.
NB - Nominal Bore (internal diameter of a pipe or fitting)
NB - Nuclear Blast, music record label
New Balance — a brand of shoe produced by New Balance Athletic Shoe, Inc.