This symbol, also known as Livathens Cross is the alchemical symbol for Sulfur, (Brimstone) which is spiritually analogous 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. Depicted on the bottom is an infinity sign, and above is a double cross. The Double cross symbolizes protection and balance between persons. The infinity sign underlines the constant and infinite nature and most likely symbolizes the eternal universe
This glyph is often referred to incorrectly as the “pontifical cross of Satan” by Christian tract writers, due to its adoption as an emblem of Satanism by Anton LaVey in the 1960s. The emblem has no history as a symbol of Satanism outside of LaVey’s usage.