Sign language cookies, in English called "FORTUNE COOKIE", in fact, is a layer of crunchy pie crust made of Yuanbao, wrapped in a paper, written with interesting or inexplicable words. I think it was probably more popular in Guangdong or Fujian a long time ago, and was brought here by the early Chinese who came to the U.S., but later it was preserved and became the signature of Chinese restaurants, along with the hot and sour soup, the deep-fried spring rolls, and the red color of the décor. In Chinese restaurants, the waitresses will usually bring up the sign language cake with the bill when you're almost done eating. It's almost a gentle reminder that you shouldn't forget to pay, and that it's time to go.