Because the format size of different format papers is different, the format of books with the same number of pages is different because of the different format papers used. For example, "787×1092116" on the book copyright page means that the book is cut with 787× 1092㎜ full open paper.
For the text of a book, the meaning of the folio number is the same as that of the folio number, but for the folio number of the cover and the insert, the meaning is different because of the different areas. Usually, the size of a single-page publication is called folio, such as newspapers and wall charts, which are divided into full page, folio, 4 page and 8 page.
Because there are several different series of paper formats at home and abroad, although they are all cut into the same size, but the specifications are different. Although bound into a book, they are collectively called how many folio, but the size of the book is different.
In actual production, the whole paper with a width of 787× 1092 mm (3 1×43 inches) is usually called orthogonal paper. The width of the whole paper is 889× 1 194 mm (35×47 inches), which is called wide paper. Because the format of 787× 1092 mm paper is defined by China itself, it is inconsistent with international standards and belongs to non-standard format, which needs to be phased out.