What's the name of the flour put on the table at dinner?

Are you talking about the sugar on the dessert? It's frosted and covered with snow. It's called powdered sugar.

Sugar powder is generally a mixture of corn starch and broken sugar, and its taste is the same as that of sucrose. Therefore, when it is used, it is generally used as the surface decoration of western-style cakes to make them look better. Sometimes in western pastry making, there will be soft candy instead of powdered sugar, but there are still differences in taste. Especially when making cookies, you can obviously feel the importance of powdered sugar. Because powdered sugar can explain the ductility of biscuit dough and make the pattern of biscuit clearer.