Procedural signs in Morse code are a form of control character.
A form of control characters were introduced in the 1870 Baudot … See more

There were quite a few control characters defined (33 in ASCII, and the ECMA-48 standard adds 32 more). This was because early terminals had very primitive mechanical or electrical controls … See more

In Unicode, "Control-characters" are U+0000—U+001F (C0 controls), U+007F (delete), and U+0080—U+009F (C1 controls). Their General Category is "Cc". Formatting codes are distinct, in General Category "Cf". The Cc control characters have no Name in … See more

There are a number of techniques to display non-printing characters, which may be illustrated with the bell character in ASCII encoding:
• Code point: decimal 7, hexadecimal 0x07
• An abbreviation, often three capital letters: BEL See more

ASCII-based keyboards have a key labelled "Control", "Ctrl", or (rarely) "Cntl" which is used much like a shift key, being pressed in combination with another letter or symbol key. In one implementation, the control key generates the code 64 places below the code for … See more

The control characters were designed to fall into a few groups: printing and display control, data structuring, transmission control, and miscellaneous.
Printing and display control
Printing control characters were first used to control the … See more

• Arrow keys § HJKL keys, HJKL as arrow keys, used on ADM-3A terminal
• C0 and C1 control codes
• Escape sequence
• In-band signaling See more