I bought this patch a couple of days ago from the Museum of Witchcraft and Magic in Boscastle, Cornwall, UK. I was wondering if it actually has any significance or meaning, or if it just looks cool.
Apparently, the design comes from a book (The Black Pullet, 1800s).
I'm now going to try and organise a road trip of Satanists to go visit, thanks for making me aware of its existence :)