What's the name of the copper coin used for fortune telling?

Is it true that immortals avoid evil spirits and pray for copper coins? What is the value?

Really. As early as 20 years ago, someone went to the countryside to collect 400 yuan each. Now guess the price yourself. I know what this means. I remember my sister got sick when she was 4 years old, so she hung up such a money and a big copper coin. I have worn it for 2-3 years, and nothing has happened. Rural superstition, hehe, in fact, I personally think it looks better than copper coins. Although it is not a currency in circulation, it is also considered as a folk belief culture and a religious culture. In the past, it was generally the products of the rich, and ordinary people could not afford it.