An 18th century chemical symbol indicating pyrophorus.
The term "pyrophorus" refers to a pulverized substance, typically metals, that glow with light when heated to a certain temperature. This effect is probably due to the ability of pulverized material to absorb a high degree of oxygen, thus charging the fire.
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Category: Alchemical Symbols.
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"Pyrophorus (alchemy)." Symbols.com. STANDS4 LLC, 2020. Web. 31 Oct. 2020. <https://www.symbols.com/symbol/pyrophorus-%28alchemy%29>.