Have you guys ever wondered about the meanings of each number the girls wear when they perform "Oh!"?

    

Taeyeon chose 9 as it is the number of SNSD, 
Sooyoung chose 24 as she wants to be with the fans 24/7,
Seohyun Chose 11 to be number one in everything, 
Tiffany chose01, but while printing, an error occurred, leaving out the 1, and giving her the nickname "Team's Hole" with the number 0.
Jessica is turning 22 this year, so she chose the number 22, 
Yuri chose 21, as it was her age at that time, 
Hyoyeon had no special meaning, but just as her favorite number 32,
Sunny chose 12, putting her two favorite numbers, 1 and 2 together,
and lastly, Yoona chose lucky number 7♡