'NB' definitions:

Definition of 'Nb'

From: WordNet
noun
A soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium [syn: niobium, Nb, atomic number 41]
noun
A Latin phrase (or its abbreviation) used to indicate that special attention should be paid to something; "the margins of his book were generously supplied with pencilled NBs" [syn: nota bene, NB, N.B.]

Acronyms for 'NB'

From: V.E.R.A.
  • Nota bene (slang, Usenet, IRC)