noun
student number; class roll number
A number assigned to each student in a class, typically used for seating order, roll call, and administrative purposes in Japanese schools.
出席番号順に並んでください。
Please line up in order of your student numbers.
私の出席番号は12番です。
My student number is 12.
学籍番号 is a student ID number used for official records and administration, while 出席番号 is specifically for class attendance and seating order.
Compound of 出席 (attendance) and 番号 (number).