Through the pages of this book, the esoteric science-art of numerology-numerosophy is approached, which was particularly developed by the Pythagoreans in their renowned Omacoio, and which, as the word suggests, is directly related to numbers.

Thus, after a first general approach to the numbers in order to understand their theoretical and metaphysical essence, the personal numbers, the life-destiny number, numerical matrices, personal periods (year, month, day), the "matrices" of birth, life cycles, challenges, enclosures, the subconscious number, two-digit numbers, the numbers from 21 to 78, and generally anything related to the esoteric science of mathematics and the hidden meanings contained within it are explained and analyzed.

Next follows the categorization of letters, as letters correspond to numbers, and after examining the mystical nature of the letters, the metaphysics of the first name is explored, the letters according to Pythagoras, etc., and all of this is combined with astrology and Tarot.

The work concludes with practical, user-friendly ergonomic tables that demonstrate the usefulness and applicability of everything that the author discusses as a mystic of the esoteric sciences, where one complements and evolves the other in a unique way through complex, associative, and perfectly harmonious combinations.