What are the seals of calligraphy?

There are three main types of seals in calligraphy: one is the author's own seal. Second, the signer's seal. Third, the seals of collectors and connoisseurs. These seals are divided into three aspects: first, the name, font size, hall number and hall number seal; Second, write at will, seal auspicious words and aphorisms. Third, collect and appreciate seals. Name number printing: the name, table or number of the person engraved with the image. Ancient Han people had more than one name, and their three characters were printed. If there is no "print", it will be printed. Since the Tang and Song Dynasties, Zhu Wen has been regarded as the positive case, and some people have added the word "teacher" to their surnames. Modern people also have pen names, which also belong to this category. The official seal of Zhai: The ancients often named their rooms and study rooms, which were often used as seals. Don Li Qin has a seal of "End Room", which is probably the earliest seal of this kind. Book seal: the name of the seal is followed by "notice", "white matter" and "statement". Today, there are those who "bid farewell", "sincerely seal" and "nod". This kind of seal is specially used for exchanging books and letters. Collection Appreciation Seal: This seal is mostly used to cover the cultural relics of calligraphy and painting. Prosperous in the Tang Dynasty, better than in the Song Dynasty. Zhenguan written by Emperor Taizong, Kaiyuan written by Xuanzong and Xuanhe written by Song Huizong are all used for painting and calligraphy. The words "collection", "collection", "collection of books", "collection of paintings", "rare play", "secret play" and "books" are added to the collection stamps. Appreciation has added words such as appreciation, appreciation, appreciation, appreciation, appreciation, take a look and eyes. The words "revision", "examination", "assessment", "appraisal" and "revision" are added to the revised seal. There are four kinds of seals: square seal, vertical seal, rectangular seal, entry seal, oval seal ("duck egg seal"), round seal and conformal seal (natural seal or natural seal), among which square seal is the most common and widely used.