In 17th century French alchemical practices, this symbol was a "time sign" used to represent the period of an hour.
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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"Hour (alternate #1)." Symbols.com. STANDS4 LLC, 2018. Web. 16 Jul 2018. <https://www.symbols.com/symbol/hour-%28alternate-%231%29>.