Black Diamond with Question Mark �

If you see that character (� U+FFFD "REPLACEMENT CHARACTER") it usually means that the text itself is encoded in some form of single byte encoding but interpreted in one of the unicode encodings (UTF8 or UTF16).

To fix this you have to tell your browser that you need to display characters from the iso-8859-1 set so it will know how to render them correctly, put the following in HEAD tag of HTML page.

<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">

for programming languages such as PHP set the content type header to

<?php header("Content-type: text/html; charset=iso-8859-1"); ?>