The three bars of a nurse's hat represent professional titles or administrative posts. The diagonal lines on both sides of the two hats are professional title marks, one column is nurses, the other column is nurses in charge, and the third column is senior nurses. If there is a bar on a nurse's hat, it is an administrative post. One bar is the head nurse in the ward, the other bar is the head nurse in the department, and the third bar is the director of the nursing department. The three stripes on the nurse's hat indicate the administrative title of her job. Three bars generally refer to the director of nursing department. According to the technical level, it can be divided into chief nurses, deputy chief nurses, nurses in charge and nurses.