as @jbgostick points out, this is in fact an ancient symbol of protection.
It was corrupted into the ‘symbol for Satan’ mostly by Christians, who have a curious habit of attempting to make things they don’t like look evil.
The author of this post should probably make up for this rather silly and obvious myth-perpetuation by posting a feature on the history of the symbol, so that we can see they are aware and vaguely paying attention.
