The "peace" sign is from witchcraft, It comes from a ritual they do when someone from a "church" upbringing wants to join a coven. The witches get antsy and a little uneasy when someone that wasn't raised in witchcraft wants to join, so they take a cross (usually made out of clay) and make the initiate turn it upside down and break the sides down, to signify the rejection of Christianity. This gives the coven "peace" that the person is 100% into it. That's why the symbol is also referred to as a "broken cross' by witches. So remember this the next time your kid tries to tell you it's just a cool hippie symbol.