Census dates, T1, T1A, T1B, T2, T2A and T2B.... wat does all these mean? (1 Viewer)

[didlshak27]

i see phrases lyk, UNSW Payment Due Date for Semester 2 tuition fees (T2/T2A and T2B) and Census Date for Semester 1 - T1 and T1A..
wat does all these terminologies mean? thanks