12u2
12u2 is a designation that can refer to several different things, most commonly a specific type of baseball or softball team. In youth sports, leagues often categorize teams by age and skill level. The "12u" part of the name typically signifies that the players on the team are 12 years old or younger. The "u" stands for "under." Therefore, a 12u team is composed of athletes who have not yet reached their 13th birthday by a specific cutoff date, which can vary by league.
The "2" in 12u2 could indicate a second team within that age group for a particular organization