nb meaning and definition

NB noun

Definition of Nb (noun)

1. a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium
   • synonyms: atomic number 41, niobium
2. 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"
   • synonyms: N.B., nota bene