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[Alexandr Korol]

The sacred marriage — the union of the masculine and feminine principles, the merging of opposites.
The latter, in European alchemy, takes the form of the “chemical wedding,” “royal marriage,” the union of brother and sister, the Sun and the Moon, Hermaphrodite and Salmacis, the male and female of various animals, etc.; in Indian alchemy, it appears as the union of Shiva and Shakti; in Chinese alchemy, as the joining of the dragon and the tiger or the meeting of the Cowherd and the Weaver Girl (Heavenly Maiden).
In the Alexandrian, Arabic, and European alchemical traditions, the idea of death (usually in the form of a killing) and resurrection also plays an extremely important role.”

There’s a separate section in Wikipedia called “Alchemical symbols.”
“Alchemical symbols, originally developed within the framework of the proto-science of alchemy, were used to denote certain chemical elements and compounds up until the 18th century. The design of the symbols was largely standardized, but both the symbols themselves and the style of their depiction could vary among different alchemists”. What follows are examples of the most commonly used symbols and their typical forms.