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41a:5 ·
The old sign for the planet Mars,  , also a sign for iron, became, with a horizontal bar added to it, the sign for a compound of iron and sulphur, ferrohydrosulphate. This sign was used both in alchemy and early chemistry. Placed horizontally,  , the sign was at times used to represent the metal magnesium.
Pointed diagonally upward, as  , the sign was used for chalybs, or steel in eighteenth-century chemistry.
See  in Group 41:b for more signs for steel.
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