сокращение от acknowledge(d) подтверждаю получение (расписка)
сокращение от acknowledge (character) символ подтверждения приёма, квитанция
сокращение от acknowledgement подтверждение приёма, квитирование
abbreviation acknowledge; acknowledgment
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.