In alchemy, Planetary metals were "dominated" or "ruled" by one of the seven planets known by the ancients. Although they occasionally have a symbol of their own (denoted by also:), they were usually symbolized by the planet's symbol.

* Gold dominated by Sol ☉ ☼ ( Sun symbol.svg )
* Silver dominated by Luna ☽ ( Crescent.svg )
* Copper dominated by Venus ♀ (also: Copper symbol.svg )
* Iron dominated by Mars ♂ ( Mars symbol.svg )
* Tin dominated by Jupiter ♃ ( Jupiter symbol.svg )
* Mercury (quicksilver) dominated by Mercury ☿ ( Mercury symbol.svg )
* Lead dominated by Saturn ♄ ( Saturn symbol.svg )

The planets Uranus and Neptune and the dwarf planet Pluto were discovered after the time alchemy had been largely replaced by chemistry, and are not part of traditional Alchemical symbols. Some modern alchemists consider the symbols for these planets to represent the radioactive metals uranium, neptunium and plutonium, respectively. Also, the Monas Hieroglyphica is an alchemical symbol devised by John Dee as a combination of the planetary metal glyphs.