What does Yu mean?

It means rich.

Economic prosperity refers to wealth, which can be measured by money. Personal income, family income, personal property and family property are important indicators of economic prosperity.

Material affluence refers to the affluence of all things that are visible, tangible and beneficial to people, which corresponds to the spirit. It includes not only people's personal material wealth, such as the number of deposits, appliances, cars, housing area, etc., but also social material wealth, such as per capita road mileage, per capita green space area, number of hospital beds per 100 people, excellent days, water resources, etc.