The platinum-group metals, also known as the platinoids, platinides, platidises, platinum group, platinum metals, platinum family or platinum-group elements, are six noble, precious metallic elements clustered together in the periodic table. Wikipedia

A collective name used for six chemical elements in the periodic table Wikipedia Disambiguation

In chemistry a group of elements with related properties similar to that of platinum. Notably high resistance to chemical activity, particularly oxidation and reaction with acids. The platinum group consists of the elements ruthenium, rhodium, palladium, osmium, iridium, and platinum. In the periodic table of the elements they are in period 5 or 6 and in groups 8, 9 or 10. Wiktionary

Group of elements. Wiktionary (translation)