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.
Symmetric, Closed shape, Monochrome, Contains straight lines, Has crossing lines.
Category: Alchemical Symbols.
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"Pyrophorus (alchemy)." Symbols.com. STANDS4 LLC, 2018. Web. 21 Apr. 2018. <http://www.symbols.com/symbol/pyrophorus-%28alchemy%29>.