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platinum
A precious silvery-white metal used in jewelry, catalytic converters, and various industrial applications. The Japanese name literally means 'white gold'.
In jewelry contexts, プラチナ (the loanword from English/Spanish) is more commonly used in advertising and everyday conversation, while 白金 is the traditional Japanese term used in science and formal contexts. Note: 白金 (read しろかね) is the place name for the Shirokane district in Tokyo. The element symbol is Pt. Related: プラチナ (platinum — loanword, common in jewelry marketing), 金 (gold), 銀 (silver).