In college(SCAD) we were taught it was an archaic misinterpretation or translation of the bible that horns represented wisdom that Moses received from God when he came down the mountain with the ten commandments. It lasted hundreds of years, but went out of fashion with revised/more popular translations and such. I don't think that site exactly got it right, but it's not far off. Regardless, it was an interesting historical concept to play off of.
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