ASCII ASCII For other uses see disambiguation.There are printable ASCII characters numbered to.ASCII American Standard Code for Information Interchange generally pronounced ski ASK ee is a character set and a character encoding based on the Roman alphabet as used in modern English see English alphabet ASCII codes represent text in computers in other communications equipment and in control devices that work with text Most recent character encoding has an ASCII like base.
ASCII defines the following printable characters presented here in numerical order of their ASCII value.
 amp '.. ABCDEFGHIJKLMNOPQRSTUVWXYZ _
 abcdefghijklmnopqrstuvwxyz
 Printable Representation the Unicode glyphs reserved for representing control characters when it is necessary to print or display them rather than have them perform their intended function. Control key Sequence the traditional key sequences for inputting control characters The caret represents the Control or Ctrl key that must be held down while pressing the second key in the sequence The caret key representation is also used by some software to represent control characters. The Backspace character can also be entered by pressing the Backspace Bksp or key on some systems. The Delete character can also be entered by pressing the Delete or Del key It can also be entered by pressing the Backspace Bksp or key on some systems. The Escape character can also be entered by pressing the Escape or Esc key on some systems. The Carriage Return character can also be entered by pressing the Return Ret Enter or key on most systems. The ambiguity surrounding the Backspace key comes from systems that translated the DEL control character into a BS backspace before transmitting it Some software was unable to process the character and would display H instead H persists in messages today as a deliberate humorous device e g there's a sucker H H H H H H potential customer born every minute A less common variant of this involves the use of W which in some text editors means delete previous word The example sentence would therefore also work as there's a sucker W potential customer born every minute.
ASCII printable characters
Code the space character denotes the space between words as produced by the large space bar of a keyboard Codes to known as the printable characters represent letters digits punctuation marks and a few miscellaneous symbols.
Seven bit ASCII provided seven national characters and if the combined hardware and software permit can use overstrikes to simulate some additional international characters in such a scenario a backspace can precede a grave accent which the American and British standards but only those standards also call opening single quotation mark a tilde or a breath mark inverted vel.
Processors can convert uppercase characters to lowercase by adding to their ASCII value in binary devices can accomplish this simply by setting the sixth least significant bit to.
Aliases for ASCII
RFC published in June and the IANA registry of character sets ongoing both recognize the following case insensitive aliases for ASCII as suitable for use on the Internet.
 canonical name. 
 ASCII
 US ASCII preferred MIME name. us
 US
 irv 
 iso ircs
 ASCII
Of these only the aliases US ASCII and ASCII have achieved widespread use One often finds them in the optional charset parameter in the Content Type header of some MIME messages in the equivalent meta element of some HTML documents and in the encoding declaration part of the prolog of some XML documents.
Variants of ASCII
As computer technology spread throughout the world different standards bodies and corporations developed many variations of ASCII in order to facilitate the expression of non English languages that used Roman based alphabets One could class some of these variations as ASCII extensions although some mis apply that term to cover all variants including those that do not preserve ASCII's character map in the bit range.