NB

Multiple Entries:
  NB    Nb    nb    niobium  

Concise Oxford English Dictionary © 2008 Oxford University Press:
NB/enˈbiː/

▶abbreviation

• 1 New Brunswick (in official postal use).

• 2 nota bene; take special note. [Latin.]

Concise Oxford English Dictionary © 2008 Oxford University Press:
Nb

▶symbol the chemical element niobium.

Concise Oxford English Dictionary © 2008 Oxford University Press:
nb

▶abbreviation Cricket no-ball.

Concise Oxford English Dictionary © 2008 Oxford University Press:
niobium /nʌɪˈəʊbɪəm/

▶noun the chemical element of atomic number 41, a silver-grey metal used in superconducting alloys. (Symbol: Nb)

– origin C19: mod. L., from Niobe, daughter of Tantalus in Greek mythology (because the element was first found in tantalite).