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 | Magnesia\Magnesium (alchemy) Resembling a trident, this sign is a 16th century chemical symbol for magnesia. |
 | Magnesia\Manganese An 18th century chemical symbol representing both magnesia and manganese. |
 | Magnesia\Magnesium (alternate #1) A symbol used in early chemistry to represent magnesium. |
 | Magnesia\Magnesium (alternate #2) A 17th century alchemical sign used to indicate magnesium. |