Gold is a chemical element with the symbol Au - and the atomic number 79. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable and ductile metal.
G 8412 (OTTO) Gold sputtering target, diam. × thickness 25.4 mm × 0.2 mm, 99.99% - used for the protective coatings on many artificial satellites.