Bank

The Bank (書庫 (バンク) ) is a comprehensive database in Academy City which has been said to hold all of Academy City's data. Within the large amount of data stored in the Bank is AIM diffusion energy field data of Espers. . It should be noted that records about the students of academy city can also be found within the banks.

Access to the banks is not unrestricted, it has been shown that only the major institutions from Academy City have access to them, such as Anti-Skill or the Academy City Board of Directors. It has been revealed that the Bank has levels of access, and even executives from the Board of Directors cannot access data after a certain point of security is reached

Trivia
Initially, Misaka Mikoto stated that Touma's ability 'was a fraud' judging that in the Bank there are no records of a negating ability. Though it is later shown that the Imagine Breaker is listed in the Bank despite note being an Esper power, with a note about it's negating ability attached.Shinyaku Toaru Majutsu no Index Light Novel Volume 07