What is Sulfur?

[Paul Ferguson]

"Medieval alchemists elevated sulfur to one of their three fundamental principles (tria prima), alongside mercury and salt. To these early chemists, sulfur represented the soul, combustibility, and masculine energy. Its alchemical symbol—a triangle atop a cross—became known as “Satan’s Cross” due to religious associations with hellfire. Despite these mystical overtones, alchemists’ experiments with sulfur laid crucial groundwork for modern chemistry."

https://briandcolwell.com/what-is-sulfur/