A sandwich board is a type of advertisement tool composed of two boards with a message or graphic on it and being either carried by a person, with one board in front and one behind in a triangle shape, hinged along the top, creating a "sandwich" effect; or set up next to a store advertising its goods. In this way, the advertising message can be read on both sides interchangeably.
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Sandwich board in the context of Information sign
Signage is the design or use of signs and symbols to communicate a message. Signage also means signs collectively or being considered as a group. The term signage is documented to have been popularized in 1975 to 1980.
Signs are any kind of visual graphics created to display information to a particular audience. This is typically manifested in the form of wayfinding information in places such as streets or on the inside and outside buildings. Signs vary in form and size based on location and intent, from more expansive banners, billboards, and murals, to smaller street signs, street name signs, sandwich boards and lawn signs. Newer signs may also use digital or electronic displays.