Palladium

The largest use of palladium today is in catalytic converters.
Palladium is also used in jewelry, dentistry, watch making, blood sugar test strips, aircraft spark plugs, surgical instruments, and electrical contacts.
Palladium is also used to make professional transverse (concert or classical) flutes. As a commodity, palladium bullion has ISO currency codes of XPD and 964. Palladium is one of only four metals to have such codes, the others being gold, silver and platinum. Because it absorbs hydrogen, palladium is a key component of the controversial cold fusion experiments that began in 1989.