What is the difference between cathead and nak?
cathead | nak |
(nautical) A heavy piece of timber projecting from each side of the bow of a ship for holding anchors which were fitted with a stock in position for letting go or for securing after weighing.
Similar rigging on the outside of a building.
(computing): A negative ACK; a response indicating that a message was not fully received, or that there was a problem with the message.