Safety signs of special labor protection articles shall be identified and numbered by three-layer numbering and letter combination numbering. The two digits on the first floor represent the year when the mark was authorized; The two digits on the second floor represent the division code of the provincial administrative region to which the manufacturer authorized to use the logo belongs (imported products, and the code on the second floor indicates the country code of origin of the imported products with two English abbreviations); The first three digits of the third layer code represent the product name code, and the last three digits represent the order of identification authorization.