From ancient times, certain numbers have attracted the special attention of people. The coincidences, combinations, correlations with natural laws, and various incidents associated with these numbers have given rise to people being inspired and developing a kind of secret worship around these numbers, worship that still defines our lives today. It is no coincidence that mythology, theology, occultism, magic, and folklore are flooded with the number 3. Have you ever wondered why ancient mysteries with the symbolism of the number 3 hide their essence or why all religions speak of the triunity of God? Have you ever wondered why the Apostles were 12 or why the number 666 is associated with the Antichrist? Have you ever wondered why your priest swings the censer three times or why the steps of the Beautiful Gate in the temple are three or why spells are recited three times? These and dozens of other questions find their answer in this study, which includes the views of researchers and the wisdom of the Mystics from antiquity to the present day.