During the Eastern Han Dynasty, a man named Fei Changfang saw an old man selling medicine in the street. All the patients who took his medicine took immediate effect and the medicine was cured. After seeing it, Fei Changfang wanted to learn from the elderly. So I followed the old man when he was away and saw him jump into a gourd hanging on the hotel wall. I don't think the old man is waiting for someone to close the door, which further increases his determination to learn from the teacher. So, he prepared a waiting banquet in the place where the hotel hung the gourd, waiting for the old man to come out Soon, the old man jumped out of the gourd. Fei Changfang immediately kowtowed for advice. Seeing Fei Changfang's sincerity in learning, the old man took him as a disciple and taught him medical skills. Later, Fei Changfang became a famous doctor at that time. In memory of the old man, he always carries a gourd when practicing medicine. Since then, the doctor has used the gourd as a signboard to show his superb medical skills, so people regard the gourd as a sign of a doctor.
Now, doctors no longer use the "hanging pot" as a signboard, but their sincerity and goodwill to patients have not changed. "Hanging pot" is just a form, and saving talents is the essence.