"旒" is a standard second-level character in modern Chinese. It is pronounced as liú in Mandarin and is a pictophonetic character in the Six Books. The basic meaning of "旒" is the decoration hanging from the bottom or edge of an ancient banner, such as a hanging flag; its extended meaning is the jade string hanging from the front and back of an ancient emperor's hat, like a crown with a bow in front.

The introduction of Jiuqimian is as follows:

In 1970, archaeologists excavated the tomb of King Luhuang of the Ming Dynasty in Jiulong Mountain in Zoucheng, Shandong. The tombs are basically well preserved, and more than a thousand cultural relics were unearthed, each of which is of high quality. One of the nine-shaped crowns is the only well-preserved actual crown of a Ming Dynasty prince found in China so far. The current research on the crowns of the Ming Dynasty mainly refers to the nine-shaped crown of King Luhuang.

The structure of Jiuqiaomian is as follows:

The main body of Jiuqiaomian is composed of 3 parts: the main body of Jiuqiaomian is called Guanwu, which is cylindrical and has a diameter of about 18.5 centimeter, made of bamboo strips, painted with black paint, and decorated with gold edges around the body and edges of the crown. There is also a golden hairpin crossing the upper part of Guanwu.

The long board on the top is called the crown board, also called "yan", and its surface is also painted with black paint. The early crown boards were wrapped in black cloth, maybe black is more solemn. The crown plate is not a regular rectangle, but has a shape with a round front and a low back, and a low front and high back. It coincides with the saying of "the sky is round and the earth is round", and at the same time, "the front is low and the back is high" is a warning to the emperor to use the virtue of humility.

There are 9 hooks on the front and back of the crown plate. And each line is made of 9 jade beads. The colors on each string of beads are also particular, consisting of red, white, green, yellow and black intervals, which coincide with the colors of the five elements. King Luhuang was at the level of a prince, and the 9 beads and 9 beads were in line with the etiquette of the crown at that time. If he were an emperor, according to the etiquette of the Ming Dynasty, he would need 12 beads and 12 beads.