Xi is a traditional auspicious pattern of Han nationality, which consists of two festive symbols. One of the customs of decorating new houses in Han nationality is popular in ancient and modern times. At the wedding, the big red double happiness characters were cut out and pasted on the bridal chamber nave. Refers to the day when both men and women welcome the festival together during marriage; It is also used in weddings and other festive occasions to express happiness and blessings. (So it is generally used for marriage)