That would be the Church of Jediism symbol. The guy who wrote the book is their founder.
Dang, I was going to say the artist formerly known as prince.
Some quick searching indicates a similarity to the sickle of cronus,
(for those who missed middle school, Cronus was the one who ate his kids, until his wife got moody and tricked him, then Zeus (being the snot that he was) went and took over the world, and sent his dad to the naughty corner.
He used said sickle to separate Uranus from his wossname (the wossname in question was at some point thrown into the ocean, and keep up here, caused some foaminess, from which Aphrodite magically appeared. Possible explaining why ol' Aph had testosterone through the roof, and, as I believe they say these days
loved to party )
but, since (as far as I know) none of those make believe gits are around to defend their IP, I guess there's no harm is throwing a vaguely mystical / alchemical symbol on a book cover.
(a similar glyph is also used in the computer RPG Arcanum as a the symbol for the "White Necromancy" or "healing" college of magic, as well as the "Force" or lightning college - It's a pretty big stretch, but there's every change this coot is just like me, played the same computer games as me, so the symbol next to the word "Force" and went "meh, that works, and this game was a flop, so who the hell is going to notice?" - I'm not calling foul play or anything, just that symbols, for the most part are just whatever seems good at the time. If there's a neat historical link you can persuade your audience gives it some sort of authority or gravitas, then all the better)
