In Christianity, this type of sign is known as a crutch cross. In alchemy it is one of several signs indicating vinegar.
Symmetric, Closed shape, Monochrome, Contains both straight and curved lines, Has crossing lines.
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 »
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"Vinegar (alternate)." Symbols.com. STANDS4 LLC, 2018. Web. 21 Apr. 2018. <http://www.symbols.com/symbol/vinegar-%28alternate%29>.