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30:3 ·
The circle divided by a vertical line is an ancient sign of the alphabets used in antiquity in the Near East. The alchemists used it to signify nitrogen, or saltpeter. Among the Hittites  and  were closely associated with the idea of lightning.
In his nineteenth-century system for the chemical elements John Dalton used for nitrogen.
Some meteorlogical sign systems used for solar halo.
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