This is similar to CU’s Chaos Star, Wheel of Fate (doubtedly because it is casino) or Symbol of Chaos. But here is nothing to do with Cirith Ungol, only similar. I don’t know the source of CS.
✳ ❊ ❋
The similar is that the Cross of the eight-point cross-stone ceremony. It is a symbol of revival and is similar to the Greek word “XI” (the capital letter of the word Christ). And there is similar to Eight spoked asterisk (U+2733;), Six Teardrop-Spoked Propeller Asterisk (U+274A / ❊), Heavy Eight Teardrop-Spoked Propeller Asterisk (U+274B / ❋) etc. But here is nothing to do with Cirith Ungol, only similar.
There was a record label from 1957, similar to Cirith Ungol’s Chaos Star.
And also extremely others Chaos Star things.
Also see Logos.