"Columbium" shine sunan tsohon sunan sinadari da ake kira niobium (Nb). Niobium sinadari ne na ƙarfe tare da lambar atomic 41 da alamar Nb. Ƙarfe ne mai laushi, mai launin azurfa-fari wanda aka fi amfani da shi a cikin nau'i-nau'i daban-daban, kamar wajen samar da kayan aiki na musamman, kayan aikin sararin samaniya, da kuma kayan aikin likita. Kungiyar International Union of Pure and Applied Chemistry (IUPAC) ta karbe sunan "niobium" a hukumance a shekarar 1950, amma har yanzu ana amfani da "columbium" a wasu lokuta, musamman a Amurka.