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A pair of overlapping triangles, or a stylised S-and-Z form depending on the source.
Also known as: Arsenic sign
Arsenic has no single settled sign: manuscripts use overlapping triangles, a doubled Z-like stroke, and several other forms. It is a clear example of how unstandardised the notation really was.
Denotes arsenic, most often drawn as two overlapping triangles, though several unrelated forms appear across different manuscript traditions.
There is no single canonical sign for arsenic. Sources that present one are simplifying a genuinely inconsistent notation.
Encoded at U+1F71A ALCHEMICAL SYMBOL FOR ARSENIC, which fixes one of the competing forms for digital use without settling the historical question.
Contexts: Software
Two triangles overlapping one another, drawn as outlines rather than filled.