'The Valkyrie', Hans Makart, 1877

The alchemy symbol for potassium typically features a rectangle or open box ("goalpost" shape). Potassium is not found as a free element, so alchemists used it in the form of potash, which is potassium carbonate.

There were several different symbols for the metal magnesium. The element itself is not found in pure or native form; rather, the alchemists used it in the form of "magnesia alba," which was magnesium carbonate (MgCO3).

"Philosopher's wool" was zinc oxide, sometimes called nix alba (white snow). There were different alchemy symbols for the metal zinc; some of them resembled the letter "Z."

These are the Egyptian alchemical symbols for the metals. From Lepsius, Metals in Egyptian Inscriptions, 1860.

Although alchemists in different parts of the world worked with many of the same elements, they didn't all use the same symbols. For example, the Egyptian symbols are hieroglyphs.

These are some of the alchemical symbols used by Carl Wilhelm Scheele, a German-Swedish chemist who discovered several elements and other chemical substances. H.T. Scheffer, Chemiske forelasningar, Upsalla, 1775.
One alchemist, Carl Wilhelm Scheele, used his own code. Here's Scheele's "key" for the meanings of the symbols used in his work.

Excerpt: Jacob Böhme ~ Beschreibung der Drey Principien Göttlichen Wesens ∫ Die Tore der Tiefe

11
THE GATES OF THE DEEP

Think that you are not at home in this world,
but are a strange
guest in a heavy prison, imprisoned:
Cry out and plead to Him who has the key to the prison, surrender to him
surrender to him in obedience to righteousness,
discipline and truth; do not seek the
kingdom of this world so hard, it will
enough without it: so will the chastening
the chaste virgin will answer thee high
and deep in your mind, who will
lead thee unto thy bridegroom, who hath
who has the key to the gates of the deep.
Before him you must stand, he will give you
of the heavenly manna to eat, which will
manna, which shall refresh thee, and thou shalt be strong
become strong and wrestle with the gates
of the deep. Thou shalt break through as the
as the dawn: and though thou liest
in the night, the rays of the dawn
the rays of the dawn of day will appear to you in the paradise.

🤣😂🤣🤣☝️ black Gagarine