Bank

The Bank (書庫 (バンク) ) is a comprehensive database in Academy City which is said to hold all of Academy City's data, from student records to AIM diffusion energy field data. Only major institutions from Academy City like Anti-Skill and the Academy City Board of Directors have any access to the Bank. There are multiple access levels, and even members of the Board of Directors can't access everything.

Trivia
Misaka Mikoto initially calls Touma's ability a fraud because the Bank does not contain any record of a negating ability. It is later revealed, however, that Imagine Breaker is listed in the Bank despite not being an Esper power, with a note about its negating ability attached.