The thick lines around the frame layout are also called sidebars. The top is called "upper column", the bottom is called "lower column", and the two sides are called "left and right columns" respectively. A single line is called "unilateral" or "single line", and a double line is called "bilateral" or "double line". Some printed page frames have two columns and one line, and two lines on both sides, which are called "left and right bilateral" or "left and right double columns".
Within the layout of a line, it is divided into several lines, each with a few words. When appraising records, people are used to counting by half page, which is called "half page × line× word", and some are called "line× word". If there are two lines of words in each line (usually large notes), it is called "small words × lines × words". If the number of words in double lines is the same as that in single lines, this way of description and explanation is called line format, also called line width.
The middle position of each page is also called a section. There are usually black lines and fishtail patterns as folding criteria, and some are also printed with the title, volume number, page number and the number of words on this page. Before the Ming dynasty, the name of the engraver was often printed under the center of the plate.
The figure used for folding reference in the middle of the fishplate is named as a single fishtail because it looks like a fishtail, and there is a symmetrical fishtail at the top and bottom, which is called a double fishtail.
After the Song Dynasty, the book binding was symmetrical with the plate as the center, and then glued or stitched. The standard of folding is mainly fish tail, and sometimes a black line is printed on the fish tail as a marking line, which is called elephant trunk. When a book with black lines is bound into a bag back or thread-bound, the book mouth is dark black, so it is called black mouth, in which thick lines are called big black mouth or wide black mouth, and thin lines are called small black mouth or thin black mouth. What is not added is called white mouth.
At the top of the left column of the book ear rack, there is always a small box with the title engraved inside, which is called book ear or ear lattice. Mainly seen in the layout of butterfly clothes in Song Dynasty.
The borders of red bars are called red bars, and black bars are called black bars. Mainly seen in books written before the Tang Dynasty. During the Ming and Qing Dynasties, workshops specialized in printing stationery of various colors, and ancient books copied on stationery of different colors were usually directly recorded as red squares, Haig squares, blue squares, green squares and so on.