The Mark of the Beast is a "Black Spot."
JAMES KNOX'S DECEPTION: THE MARK OF THE BEAST WILL BE A "BLACK SPOT"
One recent teaching given by James Knox on Nov 6, 2021 is titled, "The Mark of the Beast / Chapter 13 / Lesson 146." In this teaching, James Knox identifies the Mark of the Beast as being a "black spot" that will be received in the middle of one's forehead. Knox rationalizes this with the absurdity that because the Beast described in Rev. 13: 2 is partly "like unto a leopard" and all leopards have black spots, then the Mark of the Beast will be a "black spot."
Knox doesn't want known the true identity of the Mark of the Beast, which is the hexagram on the State of Israel's flag.

The Mark of the Beast