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An [abbreviation|Acronym] for __n__ot __ack__nowledged. ASCII character NAK 0x15 (^U) is used in simple serial protocols to signal that a block of data was not recieved correctly and should be resent. Also used as the name for a pulse in the electrical protocol of a chip or for one of its pins. Frequently used by [nerds|Nerd] as a humorous reply to "[ENQ]" Compare [ACK].
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