|Look up ACK, ack, ack., or ␆ in Wiktionary, the free dictionary.|
ACK or Ack may refer to:
- Andrew Haldane (1917–1944), known as Andy and nicknamed "Ack-Ack", an officer in the United States Marine Corps in the Pacific Theatre during World War II and "one of the most revered figures in the history of the U.S. Marines
Arts, entertainment, and media
- Ack, the sound the Martians made in the movie Mars Attacks! (1996)
- Amar Chitra Katha, an Indian comic book series
Computing and technology
- ACK, a flag used in the Transmission Control Protocol (TCP) to acknowledge receipt of a packet
- ack, a command-line program similar to grep
- Acknowledge character, a control character used in ASCII
- Amsterdam Compiler Kit, a fast, lightweight and retargetable compiler suite
Organizations and institutions
- Acklington railway station, a rail station in the UK
- Armstrong Whitworth F.K.8, an early aircraft known as the "Big Ack"
- Nantucket Airlines, an American airline
- Nantucket Memorial Airport, an airport in the US
- ACK or Aka-Kora language, an extinct Great Andamanese language
- ACK or ACK1, a synonym for TNK2, an enzyme that in humans is encoded by the TNK2 gene
- "Ack ack", from signalese for AA, referring to anti-aircraft artillery fire
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