Abstract: A modular constructional toy kit for use in forming signs is made up of modular elements, each of which comprises a body portion having a planar forwardly facing surface with a bounding periphery having a regular geometric shape, and coupling elements for coupling the modular elements together with the planar surfaces generally residing in a plane and the body portions in side by side relationship. A set of e.g. alphabetic characters is provided, each character being arranged on a discrete portion of planar sheet material bounded by a margin complementary to the periphery of the body portion. Preferably the characters are die cut on the discrete portions of sheet material so as to form the character and at the same time a reverse character, either of which may be applied to the planar surface of the modular elements.