Numerology is one of the oldest magical systems in the history of human civilization. In fact, symbols and numbers form their own language, the understanding of which is the key to knowing the secrets of the world. This book will take the reader on an unforgettable journey through the world of numbers and symbols. Going sequentially from 0 to 21, the reader will plunge into the world of ideas expressed in esoteric traditions, mythology and religions. Step by step, all the chaos of familiar and unfamiliar symbols and concepts will become clear and accessible. The numerological principles in the book relate to the tarot arcana, to alchemical concepts, sacred geometry, fairy tales, myths and psychology, which helps to understand them in a completely new way, to see the unity of different ways of knowing the world.