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

synoniemen: atomic number 41, niobium.

Nederlands: niobium
Pools: niob, Nb

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.

synoniemen: N.B., nota bene.