Jewish Hand-reading (Palmistry)
 

More specifically this hand-reading or palmistry comes from the Cabala which is an esoteric part of Jewish practices. This rabbinical practice is elaborated on in the book Jewish Hand-Reading by Dr. Matthew Lemberg. It has to do with the Jewish Tree of Life. Dr. Lemberg explains that the Palmistry is derived and/or used in conjunction with that diagram. In other words, the 10 sephirots seen in the Tree of Life. For example, let's take at random the Gevurah. When looking at the Palmistry, the Gevurah hand refers to discipline, such as children when they are in their formative years, during which they are impressionable. And in adults, it can refer to sexual abstinence. I suppose such men would be adept at practicing celibacy. (Or maybe they have a testosterone problem.) After all, we know there are many Yogis who practice such abstinence. Anyway, this Gevurah is one of the 10 palm-prints which correspond to the 10 sephirots of the Tree diagram.