Look at the double interlaced triangle over your head; it represents the Macrocosm with all the forces contained therein, the interpenetration and union of Spirit and Matter, within the never-ending circle of eternity. Look at the smaller symbol upon the table before you; it represents the same elements within the constitution of Man. If you can bring the double interlaced triangles existing within your own body into harmony with those existing in the Universe, the powers of nature will be yours, and you will be able to guide and control them."
This is what the "double interlaced triangle" means to the Alchemist:
https://www.sacred-texts.com/sro/wta/wta08.htm