Pi loan is not the business of a specific bank, but a form of digital RMB loan. Shanxi, Suzhou and other places have implemented loan methods. Pi loan is a special type of loan. Borrowers can apply for loans from lending institutions with their own digits of pi as collateral. Because pi is an immutable mathematical constant, it is considered to have a stable value and can be used as collateral. However, it should be noted that pi loan is not a loan business provided by all banks, but a loan method implemented by specific regions or institutions. So the pi loan does not belong to a specific bank.