I’m not sure exactly how it works, but you might be interested in some of these threads:
- Giordano Bruno’s Memory System
- Giordano Bruno's De monade numero et figura (On the Monad, Number and Figure)
- Lullian Wheels
- Ars Combinatoria, Bruno, Llull
- Giordano Bruno: De Umbris Idearum ('The Shadow of Ideas')
- Bruno’s “Incantations of Circe”
- Miniature memory palaces - including your palm
- Einstein, Creativity, and "Combinatorial Play"
Look up De Umbris Idearum. Here’s an excerpt in Latin that shows the wheels. There is an English translation here.
It looks like the screenshot above uses the English alphabet. In the image I found from Giordano Bruno, he used 30 letters from Latin (no J, U, or W), Greek, and Hebrew, so it might be a little different.
