Negative-acknowledge character

[from the ASCII mnemonic for 0010101]

1. On-line joke answer to ACK?: “I'm not here.”

2. On-line answer to a request for chat: “I'm not available.”

3. Used to politely interrupt someone to tell them you don't understand their point or that they have suddenly stopped making sense. See ACK, sense

3. “And then, after we recode the project in COBOL....” “Nak, Nak, Nak! I thought I heard you say COBOL!”

4. A negative answer. “OK if I boot the server?” “NAK!”

"Nak" and "NAK" redirect here. For other uses, see Nak (disambiguation).

• In telecommunications, a negative-acknowledge character (NAK or NACK) is a transmission control character sent by a station as a negative response to the station with which the connection has been set up.
• In Binary Synchronous Communications protocol, the NAK is used to indicate that an error was detected in the previously received block and that the receiver is ready to accept retransmission of that block.
• In multipoint systems, the NAK is used as the not-ready reply to a poll.
• In the ASCII code, the NAK character is 0x15 (hexadecimal).

See also

• ACK

References

•  This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C" (in support of MIL-STD-188).

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