nb

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• March 1. 2016 from wordnet.princeton.edu

  NB — noun — english

  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"

• February 10. 2013 from wordnet.princeton.edu

  nb — noun — english

  a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium