Black box character in HTML?

I have built a tool that redacts text based on patterns.  I use this to remove sensitive information like social security numbers, credit cards, etc.  I am currently using this for HTML files.

Typically I just replace the text with the “X” character.  Instead of a “X” I am looking to use some type of Square character (I am thinking of just a black box).  I am not able to figure out how to do this for HTML files.

currentRegularExpressionsToSearch.redactionAsciCode = 88; //This is the asci code for an “X”, I want to do a square instead.

//This statement does the replace.
currentFileText = Regex.Replace(currentFileText, redactString, new String((char)currentRegularExpressionsToSearch.redactionAsciCode, redactString.Length));

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Does anyone know if this is possible?  Hopefully what I am looking to do makes sense.
rye004Asked:
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Arun MuruganCommented:
Use ASCII code 254.
rye004Author Commented:
Thank you Arun for your email.  I did try 254 before doing this posting.  This is what it looks like in a HTML file in Firefox.  I have attached a screenshot of what 254 looks like.
temp.jpg
crystal (strive4peace) - Microsoft MVP, AccessRemote Training and ProgrammingCommented:
how about ■ ■
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Dave BaldwinFixer of ProblemsCommented:
That looks like UTF-8 characters.  Here is a demo using black boxes from http://www.alanwood.net/unicode/geometric_shapes.html .
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
 "http://www.w3.org/TR/html4/loose.dtd">

<html>
<head>
<title>Black box character test</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<h1>Black box character test</h1>
1234567890<br>
&#9632;&#9642;&#9644;&#9646;&#9724;&#9726;<br>
&#x25A0;&#x25AA;&#x25AC;&#x25AE;&#x25FC;&#x25FE;<br>

</body>
</html>

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crystal (strive4peace) - Microsoft MVP, AccessRemote Training and ProgrammingCommented:
nice reference, Dave ~
crystal (strive4peace) - Microsoft MVP, AccessRemote Training and ProgrammingCommented:
found another html code for it:

&squf;
Julian HansenCommented:
Just to be alternative.
CSS
.squares i {
  display: inline-block;
  background: url(images/dots.gif) no-repeat center center;
  width: 8px;
  height: 8px;
}

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HTML
<span class="squares"><i></i><i></i><i></i><i></i></span>

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ImagedotsWorking sample here
rye004Author Commented:
This worked great, thank you.

Thank you for taking the time to write out the HTML.
Dave BaldwinFixer of ProblemsCommented:
You're welcome, glad to help.
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