These are used to escape characters that are markup sensitive in certain contexts:
Result | Description | Entity Name | Numerical reference
----- | ----- | ----- | -----
| non-breaking space |   |  
\< | less than | &lt; | &#60;
> | greater than | &gt; | &#62;
& | ampersand | &amp; | &#38;
" | quotation mark | &quot; | &#34;
' | apostrophe | &apos; | &#39;
¢ | cent | &cent; | &#162;
£ | pound | &pound; | &#163;
¥ | yen | &yen; | &#165;
€ | euro | &euro; | &#8364;
© | copyright | &copy; | &#169;
® | registered trademark | &reg; | &#174;
™ | trademark | &trade; | &#8482;