One of many symbols used in alchemy to designate arsenic.
Famous as a deadly poison, which it is, arsenic actually plays an important role in certain alchemical practices. At one time, it was also widely used in medicinal cures. For a more detailed rundown of this potent substance, see the symbol for 'Arsenic'.
This particular symbol is also an alchemical indicator for glass, recognizing arsenic's key role as a component in glass making.
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