1. Grade difference: Generally, grades are divided into upper, middle and lower grades, but there are also nine grades that subdivide each grade into three grades, so upper and middle grades are the best among the middle grades, and upper and middle grades are the average among the middle grades. The inscriptions in the temple are also divided into nine categories, from the top to the bottom.
2. Different meanings: In case of logo application, the two logos have different meanings. Generally speaking, the symbol of the middle class is better than the symbol of the middle class, and it has different meanings according to your own needs.
3. Different status: According to the classification method of ancient nine grades, talents are divided into upper, middle and lower nine grades, and each grade is divided into upper, middle and lower three grades. The upper position is higher than the middle position.