​This book renews the concept of the symbolic function, exploring human capacity to create and utilize symbols, semiotic systems, and realities. It offers a unique theoretical perspective on the early psychological growth of children, focusing on the symbolic function''s role in their development . In this sense, it offer new conception of the emergence of symbolic function and language. It further presents detailed analyses of semiotic function manifestations and their integration around age three, signifying a child''s entry into the "symbolic species" and its profound influence on overall mental development.