Question: Where do the symbols for male and female come from?
Disambiguated questions and answers: question: Where did the symbols for male and female originate?
Where did the alchemists' symbols for male and female come from?
Where did anthropologists' symbols for male and female come from?
answer: astrological symbols, denoting the classical planets Mars and Venus
the elements iron and copper
kinship diagrams
Natural Questions answer: Mars symbol ♂
Venus symbol ♀ (from the Wikipedia article "Gender symbol")