In 18th century chemistry, this sign indicated sal sedativus or calming salt (its name has the same root as "sedative"), a boracic acid substance.
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Category: Alchemical Symbols.
More symbols in Alchemical Symbols:
Alchemical symbols, originally devised as part of alchemy, were used to denote some elements and some compounds until the 18th century. Note that while notation like this was mostly standardized, sty… read more »