What is the name of the horizontal calligraphy work?

A plaque. The horizontal works in calligraphy works include banners, plaques, fans, picture books, long scrolls, hand scrolls and so on. A horizontal calligraphy work is called a plaque. Calligraphy is a broad concept of calligraphy, referring to the art of writing Chinese characters. The writing of all characters may become the art of calligraphy.