U+1F74C "🝌" Alchemical Symbol for Calx Unicode Character

U+1F74C "🝌" Alchemical Symbol for Calx is a historical typographic glyph used in early modern alchemy to represent calx, the powdery, ashy residue left after a metal or mineral has been strongly heated or calcined. This symbol belongs to the Alchemical Symbols block of the Unicode standard, which encodes a series of signs that alchemists employed to denote specific substances, processes, and concepts, such as calcination, which was central to alchemical practice. While no longer part of standard chemical notation, the character serves as a digital record of the rich visual language of medieval and Renaissance science, preserving the connection between esoteric tradition and the development of modern chemistry.