Banking NOS stands for 'National Operating System', which is a computer system used by banks to manage their operations. ACCTS is an acronym for 'ACCOUNTS', which are the financial records of customers that banks keep track of. Banking NOS is a system that allows banks to store and manage customer ACCOUNTS, as well as other banking activities such as deposits, withdrawals, and transfers. Banking NOS is an important tool for banks to ensure accuracy and security in their operations.