From Symbols.com

The sun sign, , with the sign for the planet Earth, , placed over it. This combination is an ideogram for chaos and confusion. It appears in a chemistry textbook written in the year 1728. Semiotically we see matter, , dominating the spirit, , by being placed above it, meaning that materialistic considerations are allowed to take precedence, resulting in chaos.     Turned the other way, , it means perfection, quinta essentia. See also .