Ma'anar ƙamus na "atomic number 39" shine adadin protons da aka samo a cikin tsakiya na kwayar zarra na sinadarin Yttrium, wanda shine 39. Yana da ma'anar musamman ga Yttrium kuma ana amfani dashi don bambanta shi da sauran abubuwa. . Yttrium yana da alamar "Y" a cikin tebur na lokaci-lokaci kuma wani abu ne na silvery-metallic element wanda ake amfani dashi a cikin manyan aikace-aikacen fasaha daban-daban kamar na'urorin lantarki, lasers, da superconductor.