In Robert & Michelle King's latest TV series, Evil, a priest in training, a forensic psychologist/mother of four, and skeptic techie-carpenter/contractor investigate for the Vatican: the potential for the supernatural, including the demonic, contesting if some people may be demons sent by the devil!
The series then has an ongoing Dan Brown Da Vinci Code-esque or Alias-like mythology, where there are "60" symbols associated with "The 60" demons that are said to arrive on Earth and possibly pave way for the Apocalypse. Not to mention the character Leland Townsend, who may or may not be the devil incarnate himself, whom is associated with one of these symbols.
So my question is, are these symbols (diagrams/scriptures of them) completely fictional and made exclusively for the TV Series or did Robert & Michelle King and other writers/producers actually take them from somewhere from our real world?
NOTE: I'm looking for a screencap for the symbols, but haven't found any yet.