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ATM SafetyPIN software is a software application that would allow users of automated teller machines (ATMs) to alert law enforcement of a forced cash withdrawal (such as in robbery) by entering their personal identification number (PIN) in reverse order. The system was patented by Illinois lawyer Joseph Zingher (U.S. patent 5,731,575).

SafetyPIN is not currently used in ATM systems, despite widely circulated rumors originating from a chain letter e-mail, mainly due to issues regarding palindrome PINs being incompatible with the system and potential security vulnerabilities that could arise if implemented.