Sunboards(with corrugation) are actually thicker than sunsheets( which are commany 3mm or 5mm)
sunboards are used for promotions of products , Infact for promotions a sheet with Vinyl printing is pasted on these sunboards.
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 of 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.