Nick Kahler, Graphic Typology of Asterisks, 2014
A sign is 'any device, fixture, placard, display, or structure visible to the general public that uses or is designed to use any color, form, graphic, illumination, symbol, writing, or visual presentation of any kind to advertise, announce, draw attention to, or identify a product, place, activity, person, institution, business, or other entity or to communicate a message or information of any kind to the public.' A ‘sign’ shall include both ‘sign face’ and ‘sign structure.’
Carl G. Liungman, "Graphic Characteristics for a Morphology of Symbols" from Symbols: Encyclopedia of Western Signs and Ideograms, 1974
