On teletypewriters and early keyboards, holding down the Control key while pressing another key zeroed the leftmost two bits of the seven bits in the generated ASCII character. 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. the German keyboard layout uses Strg as required by the German standard DIN 2137:2012-06. Abbreviations in the language of the keyboard layout also are in use.
On keyboards that use English abbreviations for key labeling, it is usually labeled Ctrl (rarely, Control or Ctl is seen).
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.
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) similar to the Shift key, the Control key rarely performs any function when pressed by itself.
