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1. /ak/ the mnemonic for the acknowledge character, ascii code 6.
2. a message transmitted to indicate that some data has been received correctly. typically, if the sender does not receive the ack message after some predetermined time, or receives a nak, the original data will be sent again.
used for end-to-end flow control; verifies receipt of one or more frames from Class 1, 2 or F services
There is also a usage "ACK?" (from sense 1) meaning "Are you there?", often used in email when earlier mail has produced no reply, or during a lull in talk mode to see if the person has gone away (the standard humorous response is of course NAK (sense 2), i.e., "I'm not here").
- Acknowledgement (data networks), a signal to acknowledge the receipt of data
- ACK, a flag used in the Transmission Control Protocol (TCP) to acknowledge receipt of a packet
- Acknowledge character, a control character used in ASCII
- Acklington railway station, a rail station in the United Kingdom
- Amar Chitra Katha, an Indian comic book series
- Amsterdam Compiler Kit, a fast, lightweight and retargetable compiler suite
- Nantucket Memorial Airport, a Massachusetts airport
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