nb

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
    

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

Related words

• Synonyms: 
  nota bene , NB , N.B. , niobium , Nb , atomic number 41