THE MONAD, NUMBER, AND FIGURE: Most Secret Elements of Physics, Mathematics, and Metaphysics.

And finally, the earliest I can find a reference to anything called "The Shield of the Magi" is from a German book published in 1591 https://www.christies.com/en/lot/lot-6011025 Amazon sells an English translation https://www.amazon.com/MONAD-NUMBER-FIGURE-Mathematics-Metaphysics/dp/B0DV4FYHKP It was written by an esoteric named Giordano Bruno. https://en.wikipedia.org/wiki/Giordano_Bruno I am not trying to be disrespectful when I say the following, so please don't take it that way: Occultism, new age spiritualism, and a few other -isms tend to borrow heavily from one another. The take bits and pieces, translate them, and make them fit their personal world view. This is not a bad thing. It means you can do the same, and that symbol can mean whatever you want it to mean.