It is the label of China Library Classification (Chinese Library Classification). Used for book classification, easy to find and use. The letters and numbers in the upper and lower lines are a label. Letters are a major category of disciplines, while numbers are a minor category of major categories.

According to a certain ideological point of view, based on subject classification, combined with the contents and characteristics of books and materials, a classification table is formed according to categories.

The China Library Classification adopts the mixed numbering of Chinese phonetic alphabet and Arabic numerals, with one letter representing a major category, reflecting the alphabetical order of major categories, and the disciplines subdivided under major categories are composed of Arabic numerals. In order to adapt to the development of industrial technology and the classification of this kind of literature, the two-letter classification of industrial technology is adopted.

App application

China Library Classification has been widely used in all kinds of libraries in China, and the classification numbers of China Library Classification are recorded in major domestic large-scale bibliographies, retrieval publications, machine-readable databases and Chinese national standard book numbers.

The above contents refer to Baidu Encyclopedia-China Library Book Classification.