My last alchemical symbol, used for calx (lime) or calx vive (quicklime) from which calcium takes its name. An example is this table of alchemical symbols by Andrew Bell 1726 – 1809, where it is used for quicklime and is the tenth one down on the left hand side.

Chemistry: various alchemical symbols. Engraving by A. Bell.. Credit: Wellcome CollectionPublic Domain Mark

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