![]() This code would be converted to 000 0001, corresponding to the ASCII character with id 1 (the SOH Character). ![]() For example, the character "a" has a binary ASCII code of 110 0001. Because ASCII characters were represented as 7 bits, if a key is pressed while the Control key was held down, teletypewriters and terminals would simply set the first 2 bits of a character to 0, converting the character into a control character. The first 32 ASCII characters are the control characters, representable by a 5- bit binary number. The control characters were used as non-printing characters that signal the terminal or teletypewriter to perform a special action, such as ringing a bell, ejecting a page or erasing the screen, or controlling where the next character will display. On teletypewriters and computer terminals, holding down the Control key while pressing another key would send an ASCII C0 control character, instead of directly reporting a key press to the system. See also: Control character § How control characters map to keyboards This symbol is encoded in Unicode as U+2388 helm symbol (⎈). Also, there is a standardized keyboard symbol (to be used when Latin lettering is not preferred), given in ISO/IEC 9995-7 as symbol 26, and in ISO 7000 "Graphical symbols for use on equipment" as symbol ISO-7000-2028. Abbreviations in the language of the keyboard layout also are in use, e.g., the German keyboard layout uses Strg as required by the German standard DIN 2137:2012-06. On keyboards that use English abbreviations for key labeling, it is usually labeled Ctrl ( Control or Ctl are sometimes used, but it is uncommon). The Control key is located on or near the bottom left side of most keyboards (in accordance with the international standard ISO/IEC 9995-2), with many featuring an additional one at the bottom right. Similarly to the Shift key, the Control key rarely performs any function when pressed by itself. In computing, a Control key Ctrl is a modifier key which, when pressed in conjunction with another key, performs a special operation (for example, Ctrl+ C).
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