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In page Venus:

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The astronomical symbol for Venus is the same as that used in biology for the female sex: a circle with a small cross beneath.[1][2] The Venus symbol also represents femininity, and in Western alchemy stood for the metal copper.[1][2] Polished copper has been used for mirrors from antiquity, and the symbol for Venus has sometimes been understood to stand for the mirror of the goddess although that is not its true origin.[1][2]