Called the noble metals because they are among the scariest of the metallic elements; more important, they are totally imperious to oxidation or corrosion. The family is six metals: Platinum, a white infusible metal with high electrical resistance; Palladium, also white, noted for its strength and high ductility; Iridium, a yellowish mineral with t...
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https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/
(PGMs) The two triads of the elements ruthenium, rhodium, palladium and osmium, iridium, platinum, are grouped together under the name platinum metals. The platinum metals are all found native, almost always associated with each other and mixed with gold, silver, copper, nickel, and iron.
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https://www.encyclo.co.uk/local/22732
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