What might be an appropriate universal set of the set of girls playing badminton?

An appropriate universal set for the set of girls playing Badminton could be all individuals participating in sports or physical activities. This includes not only girls playing badminton but also those involved in other sports, such as Basketball, soccer, or swimming. Alternatively, it could be the entire population of girls in a specific region, school, or community, encompassing all interests and activities. This broader context helps to highlight the specific subset of girls who engage in badminton.