Sources:
http://www.w3schools.com/html/html_entities.asp
http://www.w3schools.com/tags/ref_entities.asp

The Most Common Character Entities:
Result     Description     Entity Name     Entity Number
      non-breaking space            
<     less than     &lt;     &#60;
>     greater than     &gt;     &#62;
&     ampersand     &amp;     &#38;
"     quotation mark     &quot;     &#34;
'     apostrophe      &apos; (does not work in IE)     &#39;
Some Other Commonly Used Character Entities:
Result     Description     Entity Name     Entity Number
￠     cent     &cent;     &#162;
￡     pound     &pound;     &#163;
￥     yen     &yen;     &#165;
§     section     &sect;     &#167;
?     copyright     &copy;     &#169;
?     registered trademark     &reg;     &#174;
×     multiplication     &times;     &#215;
÷     division     &divide;     &#247;

To see a full list of HTML character entities go to our HTML Entities Reference.