The collection chapter of the book is stamped on the bottom center of the title page or the fixed page in the book and the bottom center chapter of the last page; Periodicals and other materials often cover their books; A mark used by bibliophiles to show book ownership and express personal hobbies, also known as book collection seal; Book stamps are mostly square and rectangular in shape, and there are other irregular shapes. Modern book stamps have various shapes, including rectangles and squares, as well as circles, triangles, prisms and ellipses. There are many materials used for book stamps, such as wood, stone, metal, animal bones, ivory, plastic, plexiglass and so on.