Substitute character actions than the last one can also be undone by pressing multiple times. was one of a handful of keyboard sequences chosen by the program designers at Xerox PARC to control text editing. Presumably these particular keystrokes were chosen because of their location on a standard QWERTY keyboard, since the Z (undo), X (cut), C (copy), and V (paste) keys are located together at the left end of the bottom row of the standard QWERTY keyboard. Substitute character A substitute character (␚) is a control character that is used in the place of a character that is recognized to be
Icelandic keyboard layout Icelandic keyboard layout The Icelandic keyboard layout is a national functional keyboard layout described in "ÍST 125", used to write the Icelandic language on computers and typewriters. It is QWERTY-based and features some influences from the continental Nordic layouts. It supports the language's many special letters, some of which it shares with the other Nordic languages: The letters Å/å, Ä/ä, Ÿ/ÿ, Ü/ü, Ï/ï, and Ë/ë can be produced with the Icelandic keyboard by first pressing the or (for ¨) dead key located below the key, and then the corresponding letter (i.e. followed by yields "å"). These letters are not used