ascii           
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ascii

ascii is an acronym for "american standard code for information interchange".
computers can only understand numbers, so an ascii code is the numerical representation of a character such as 'a' or '@' or an action of some sort. ascii was developed a long time ago and now the non-printing characters are rarely used for their original purpose. below is the ascii character table and this includes descriptions of the first 32 non-printing characters. the picture was taken from lookuptables.com and if you prefer the text style, click here
extended ascii codes

0-31 and 127 are control codes. as people gradually required computers to understand additional characters and non-printing characters the ascii set became restrictive. as with most technology, it took a while to get a single standard for these extra characters and hence there are few varying 'extended' sets. the most popular is presented below, the glyph is an onscreen representation.

html codes

again, nothing to do with ascii really, but has been requested by a number of you out there. to get special characters to show on an html web page, special codes can be used (ascii code or word) and are interpretted by the web browser.

unicode

ascii has been superseded by unicode, a double byte character system designed to store and display a much wider range of letters.(65,536) the extra include foreign languages and mathematical/scientific symbols, plus space for future expansion.

for more information, please visit the following links:
¢Ù unicode.org.
¢Ú details of every unicode character there is!
¢Û blocks
¢Ü fonts - check Unicode characters support in a specific font.
¢Ý explanation of utf-8 encoding and a utf-8 browser test page.
¢Þ database of characters at the eki (http://www.eki.ee/letter/)
¢ß the alphabets of europe (http://www.evertype.com/alphabets/)
you must get permission from the respective author before reproduction