A box with a lock, used for securing items of value, as a safe-deposit box, a strongbox, a post-office box, etc.
An electronic device which can block designated cable TV channels to prevent viewing by unauthorized persons.
An accounts-receivable management system in which customers mail payments to a post office box affiliated with the company’s bank. Bank employees check the box frequently, deposit checks into the company’s checking account, and then either electronically transmit or telephone the check details to the company’s accounts receivable department. The process gives the company access to its money more quickly and saves the company from hiring more staff to process the checks. The bank charges a fee for the lockbox service.