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42:22 ·
A sign in alchemy for nitric acid. This acid was also drawn  and  .
Compare with  for hydrochloric acid.
The prefix  was commonly used to indicate an acid. One added it, for example, to the sign for sulphur, , which gave the sign for sulphuric acid,  . The sign  is an old one in alchemy for fire, and symbolized the etching and burning qualities of acids.
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