ACK

ACK is a three-letter abbreviation with multiple meanings, as described below:

a packet message used in the Transmission Control Protocol to acknowledge receipt of a packet, and the basis of TCP's reliability
the "Acknowledge" control character (code 0x06) in the C0 control code set used in ASCII
an abbreviation used in Hacker slang, see the [corresponding entry] in the Jargon File Wiki
the IATA airport code for Nantucket Memorial Airport (after "Ackerly Field")
the Amsterdam Compiler Kit
an interjection made popular in the U.S. by Bill the Cat from Bloom County
the National Rail code for Acklington railway station, United Kingdom
an acronym for Arbeitsgemeinschaft Christlicher Kirchen e.V. in Germany
a military term, in transmissions, asking for "acknowledge" (reply)

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