What Does 9u Mean

What Does 9u Mean

What do 8U, 9U, 10U, 11U and 12U mean by age group? 3

I found this in an ad, AGE / Divisions: 8U, 9U, 10U, 11U and 12U for boys and girls. What do you represent?

That is, down. For example, 8u is 8 and minus, 9 is 9 and minus, and so on.

What Does 9u Mean