NAK

character or message sent by a receiving modem to a sending modem to indicate that a data packet has arrived incomplete and must be re-sent (Computers, Telecommunications)

NaK (often pronounced as such, rhyming with "sack") is an alloy of sodium (Na) and potassium (K), and particularly one that is liquid at room temperatures. It is a commercially available material in various grades. NaK is highly reactive with air or water, and must be handled with special precautions. Quantities as small as one gram can be a fire or explosion risk.
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For the eutectic alloy see NaK. See Rakion for the creature Nak. For Nack the Weasel, see Fang the Sniper.In telecommunications, a negative-acknowledge character (NAK) 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 communication 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.
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Takenoshin Nakai (1882-1952) was a Japanese botanist.
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Acronym for negative-acknowledge character.

A transmission control character sent by a station as a negative response to the station with which the connection has been set up. (188 )188 ) Note 1: In binary synchronous communication 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. Note 2: In multipoint systems, the NAK is used as the not-ready reply to a poll.

Negative Acknowledgement

Naked At the Keyboard 
Nursing (breastfeeding) At the Keyboard  For more possible definitions for NAK, click here
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