Caret notation is a notation for unprintable control characters in ASCII encoding. For example, ^D represents the End-of-transmission character (abbrevated EOT), which can not ordinarily be shown on the screen. The letter is D, because it is the 4'th letter in the alphabet and EOT has the value 4 in the ASCII encoding. The zeroth character is represented as ^@. There are 95 printable ASCII characters, numbered 32 to 126. ... 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. ... An alphabet is a complete standardized set of letters — basic written symbols — each of which roughly represents a phoneme of a spoken language, either as it exists now or as it may have been in the past. ... There are 95 printable ASCII characters, numbered 32 to 126. ...

Many computer systems allow you to enter a control character by holding down Ctrl and pressing the letter used in the caret notation. This is practical, because many control characters (e.g. EOT) can not be entered directly from a keyboard. Although there are many ways to represent control characters, this correspondence between notation and typing makes the caret notation suitable for many applications. Model showing the current redevelopment of the Kings Cross area with the Channel Tunnel Rail Link terminal behind the barrel vaulted St Pancras Station on the left. ...

Caret notation is used in many programs, particularly Unix-viewers such as less and screen. Unix or UNIX is a computer operating system originally developed in the 1960s and 1970s by a group of AT&T Bell Labs employees including Ken Thompson, Dennis Ritchie, and Douglas McIlroy. ... The title given to this article is incorrect due to technical limitations. ... GNU Screen is a GNU utility which allows the user to emulate a terminal within a terminal. ...