Layout refers to the sum of the graphic part and blank part on one side of a book printing, periodical or newspaper, that is, including the format center and the blank part around the format center of a page of a book or periodical. Through the layout can see the layout of all the design, layout elements.

Type center is located in the center of the page, with the text of the text.

The words and symbols in the upper part of the center are collectively referred to as the eyebrows. It includes page numbers, text, and header lines. It is generally used to retrieve chapters.

Page Numbers are arranged on each side of the body of a book, usually on the side of the cut in the book. In the printing industry, one page number is called one page, and two front and back pages are called one page in book printing.

Annotations, also known as annotations, annotations, the text of the content or a word of the explanation and supplement. The intercalated notes in the lines, the footnotes at the bottom of each page, the footnotes at the end of each article, and the footnotes at the end of the book. The number that marks the annotation in the text is called the annotation code.