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Noun: Nb
  1. A soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium
    - niobium, atomic number 41
Noun: N.B.
  1. 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 N.B.s";
    - nota bene, NB

Type of: annotation, metal, metallic element, notation, note

Part of: columbite, niobite

Encyclopedia: Nb