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Daemon is the latinization of the original Greek "daimon", which basically means full of wisdom and was a guardian spirit of sorts. I agree that formalized religion and its "demon" are missing the mark in their definition. But, I suppose it's become a good catch-all phrase for things we find unfavorable and that which goes against Judeo-Christian concepts of God and righteousness.
And personally, I think the Buddha would probably be fine with your example of a derogatory description of him. We are supposed to kill him if we meet him on the road, after all. :)
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I didn't see if someone answered your question, but heres a link with the stuff they use on the show and where they got it from. http://www.supernaturalwiki.com/inde...p_%28symbol%29
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Jason Millers book on Magickal defence has a trap for lower entities and negative stuff.
It also has a blessing devoted to the goddess Hekate, to activate it.