In this book Olzhas Suleimenov, famous Kazakh poet and public figure, considers the theme of relativity of cultures and languages, who inhabit Eurasia, as in this works «AZ i IA», «The language of a letter», «Turks before history», and «Crossing parallels». The poet urges the readers to collectively solve a riddle of ancient languages and to renovate the common proto-language of humanity. «Code of the word» is aimed at professional linguists and historians, as well as readers interested in the history of our civilization as a research work wich comprises all previous publications in this field.