The bar code of the second volume of the ninth grade mathematics education edition is EAN- 13. According to the query related information: EAN- 13 barcode, which belongs to the commodity barcode, that is, the commodity code representing the second volume of the ninth grade mathematics education edition book. The ninth grade, the third grade, is the last year of junior high school. Grade 9 is called Grade 3 in Chinese mainland, but it is still used to be called Grade 3 in curriculum standards, Grade 3 in China and Hongkong, Grade 3 at first in Taiwan Province Province of China, then Grade 3, and now it is also called Grade 9.