Set the bachelor's uniform to the left. Heading is usually carried out by the principal or dean. The tassel of the bachelor's hat is set from right to left, and then the certificate is issued. This process is called heading, which is of great significance. After the introduction of tassel bachelor's hats in Britain in the early days, two colors of tassels appeared, one is gold and the other is black. Black is very common. Only students can wear it, and only senior students can have it at their own expense, which also represents a kind of prestige.