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Alternative forms
The ʃ-shaped line on the right side may be reversed, so that the symbol is symmetrical. The horizontal line of the $⟨+⟩$ shape may extend through the two ʃ's.

In charts, such as that on display at the Museum of Basel, this symbol is alphabetized under the letter 'S' rather than grouped with others by geometric shape.

Symbol

 * 1)  gum, resin, balm