<p>This is a character entity: &#169;</p>

<p>
Try to substitute the 169 in the edit window with a number (like 169), and press the "Display Result" button to view the result.
</p>

</body>
</html>

Copy it in your Note-Pad and save it as an htm or an html file and view it in your Default Browser.
Also try using different Entity Name and Entity Number as given in the earlier page.