The notions of sign and symbol appear in Kant’s early precritical writings and reappear after the introduction of the notions of intuition, the forms of intuition and the imagination in the Critical period from the Critique of Pure Reason through the practical philosophy and in the Critique of Judgment these notions play important roles. They figure in Kant’s discussion of mathematics, God, morality and the beautiful. In this seminar we consider the significance of these notions in Kant’s thought and its development.