The precious metals Ruthenium  (Ru), Osmium (Os), Rhodium (Rh), Iridium (Ir), Palladium (Pd) and Platinum (Pt) are often called the "Platinum metals" or "Platinum group elements" (PGE) or "Platinum group metals" (PGM). The terms “noble” and “precious” metals are used to cover PGM and Gold.