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1. A soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium
   - niobium, atomic number 41

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