Symbols and Characters Quick Reference Using Symbols and Special Characters There is a way to insert special characters into your HTML and XHTML code by using the entity character reference. Tables F–1 through F–3 contain the most commonly used entity characters, mathematical and technical characters, and arrow characters. Several projects in the book use the predefined entity characters to enhance content on the Web pages that you create. You can find a complete list of characters at www.unicode.org. Table F–1 Most Commonly Used Predefined Entity Characters Symbol