In Christianity, the mark representing satan. The 6 represents a sperm pointing down (towards hell), there a three of them, due to the fact that the number of letters between the "e" in the word "sex" and the "i" in the word "six" is three (being fgh).
This has the implication for males that a lust for sex will turn you into an evil bastard just like the rest of us.
It is interesting that 666 has been around longer than the microscope and knowledge of sperm!
And the number of the beast is 666.
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