Acknowledge

Acknowledge is the seventh Unicode character, being U+0006, It's located in the Basic Latin block in the Basic Multilingual Plane.

Transmission Control
The acknowledge control character is normally used as a flag to indicate no problem detected with current element, in other words, in a message transmission an acknowledge character will be sent in order to tell the transmitter that no problems occurred and no problem was detected in the message or with the transmission, hence the acknowledgement, however, if their was a problem a negative acknowledge would be sent (U+0015). It can also be used as a response from Enquiry.

Other
Currently Nothing