The character sets used in modern computers, in HTML, and on the Internet, are all based on ASCII. The following tables list the 128 ASCII characters and their equivalent number.

HTML symbols like mathematical operators, arrows, technical symbols and shapes, are not present on a normal keyboard. To add these symbols to an HTML page, you can use the HTML entity name.

Symbols or letters that are not present on your keyboard can be added to HTML using entities. To add such symbols to an HTML page, you can use the entity name or the entity number (a decimal or a …

The HTML specification encourages web developers to use the UTF-8 character set. UTF-8 covers almost all of the characters and symbols in the world!

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The default character set in HTML-4 (ISO-8859-1) were limited in size and not compatible in multilingual environments. The default character encoding in HTML-5 is UTF-8.

The first part of Windows-1252 (entity numbers from 0-127) is the original ASCII character-set. It contains numbers, upper and lowercase English letters, and some special characters.

URL encoding converts non-ASCII characters into a format that can be transmitted over the Internet. URL encoding replaces non-ASCII characters with a "%" followed by hexadecimal digits.