End-of-transmission character

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In telecommunication, an end-of-transmission character (EOT) is a transmission control character used to indicate the conclusion of a transmission that may have included one or more texts and any associated message headings.

Note: An EOT is often used to initiate other functions, such as releasing circuits, disconnecting terminals, or placing receive terminals in a standby condition. In Unix-like systems, the character is used to signal an end-of-file when typing at a terminal or terminal emulator.

EOT is also used within the PHP coding language.

In Unicode, the hexadecimal code number is 0x04. It can be referred to as control-D, ^D in the caret notation.

Source: From Federal Standard 1037C