... does it really refer to the devil's horns ... I'm more under the impression that it has been adopted as the sign of metal-ness ... I mean why display it for a band that's not even satanic ...
If you think about it, if the Devil really wanted to influence people, the last form of art he'd use is a form where everyone immdeiately associates with him right, he'd logically choose a musical form that far ranging and the least obvious choice isn't it... it kinda defeats the point to influence the masses through a musical form where the first impression is that of satanic.