Book title numbers are not only used in China.

Book title numbers are used in some applications to indicate book titles, chapter titles, newspaper titles, file names, opera titles, song titles, picture titles, movie titles, newspaper and magazine titles, chart titles, etc. Therefore it is not limited to national use.

Secondly, the book title number was originally a symbol in Russian, which is roughly equivalent to the quotation marks in modern Chinese. In the 1950s, during the craze for learning Russian, many people copied the title of the book and used it as quotation marks. Over time, it was accepted by people. At first, people called it "angle brackets", and later it was renamed the book title number.

Notes on the use of book title numbers:

Book title numbers should not be used in the names of courses, topics, prizes and certificates, trademarks, licenses, organizations, conferences, activities, etc. that can be regarded as works.