The term PASSBOOK ABBR. is an abbreviation for three words: DEP (3 letters), INT (3 letters), and ACCT (4 letters). DEP stands for deposit, INT stands for interest, and ACCT stands for account. A passbook is a type of financial record used by banks to track deposits, withdrawals, and other transactions. It is a physical book that contains a record of all the transactions made in a particular account. The abbreviation PASSBOOK ABBR. is commonly used to refer to the three words associated with a passbook: deposit, interest, and account.