content: If memory serves it has roots in some centuries old Scottish religious ritual and the burning cross is a call for God's people to repent. But don't hold me to that. I know I'm at least approximately correct but I didn't double check before making this post. The Klan is a product of the Scots-Irish folk culture in America at any rate. I hope that addresses what you're asking about. If I've posted all of that for naught my bad.