Alchemical symbol

Alchemical element salt, one of the three alchemical principals, with sulfur and mercury that makes up base material.
It is analogous to the human body.

Alchemical element Sulfur, which is analogous (similar) to the human soul.
Alchemically, sulfur has the qualities of masculine, hot and dry- combined with Mercury (feminine, cool and moist), the pair were considered the parents of all metals.

Alchemical drawings often portray Sulfur as the sun. (In some views, sulfur and salt are the parents of Mercury) The symbol of sulfur is often used as an identifying symbol by many Satanists. This glyph is often referred to incorrectly as the "pontifical cross of Satan" by tract writers, due to its adoption as an emblem of Satanism by Anton LeVey.

Mercury represented the integrative force, dynamic equilibrium, and circulation.
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Todd Helmenstine

Copper Alchemy Symbol