Are there other whitespace codes like &nbsp for half-spaces, em-spaces, en-spaces etc useful in HTML?

Question

Wondering if there are other codes available to use in an HTML newsletter.

I would use cell padding or margins but I'm new to this HTML/CSS thing and I can't find a change that does effect both the Main Title line and the sub-head under it. Being an email I'm hesitant to go mucking around with the CSS to get it just so — since I don't know what email clients don't like in the way of CSS as opposed to inline markup.

For context the template I'm using is Mute theme from Mailchimp snip:

    <!-- language: lang-html -->
<table cellspacing="0" cellpadding="0" border="0" align="center" width="626">
    <tbody>
        <tr>
            <td valign="middle" bgcolor="#546781" height="97" background="images/header-bg.jpg" style="vertical-align: middle;">
                <table cellspacing="0" cellpadding="0" border="0" align="center" width="555" height="97">
                    <tbody>
                        <tr>
                            <td valign="middle" width="160" style="vertical-align:middle; text-align: left;">
                                <img width="70" height="70" src="http://dl.dropbox.com/…….png" style="margin:0; margin-top: 4px; display: block;" alt="" />
                            </td>
                            <td valign="middle" style="vertical-align: middle; text-align: left;">
                                <h1 class="title" style="margin:0; padding:0; font-size:30px; font-weight: normal; color: #192c45 !important;">
                                    <singleline label="Title"><span>Title of Report</span></singleline>
                                </h1>
                                <h1 class="title" style="margin:0; padding:0; font-size:15px; font-weight: normal; color: #192c45 !important;">
                                    <singleline label="Title"><span>Small Subhead</span></singleline>
                                </h1>
                            </td>
                            <td width="55" valign="middle" style="vertical-align:middle; text-align: center;">
                                <h2 class="date" style="margin:0; padding:0; font-size:13px; font-weight: normal; color: #192c45 !important; text-transform: uppercase; font-weight: bold; line-height:1;">
                                    <currentmonthname />December
                                </h2>
                                <h2 class="date" style="margin:0; padding:0; font-size:23px; font-weight: normal; color: #192c45 !important; font-weight: bold;">
                                     <currentyear />2011
                                </h2>
                            </td>

                        </tr>
                    </tbody>
                </table>
            </td>
        </tr>

The whole email as a web page can be seen here

Answer 1

Yes, many.

Including, but not limited to:

• [?] hair space :  ?or  
• [?] 6-per-em space :   _{^{(no character reference available)}}
• [?] narrow no-break space :   _{^{(no character reference available)}}
• [?] thin space :  ?or  
• [?] 4-per-em space :   or  
• [?] non breaking space :   or  
• [?] punctuation space :  ?or  ?
• [?] 3-per-em space :   or  
• [?] en space :   or  
• [?] figure space :   or  ?
• [?] em space :   or  

span{background-color: red;}

<table>
<tr><td>non breaking space:</td><td> <span>&#160;</span> or <span>&nbsp;</span></td></tr>
<tr><td>narrow no-break space:</td><td> <span>&#8239;</span></td></tr>
<tr><td>en space:</td><td> <span>&#8194;</span> or <span>&ensp;</span></td></tr>
<tr><td>em space:</td><td> <span>&#8195;</span> or <span>&emsp;</span></td></tr>
<tr><td>3-per-em space:</td><td> <span>&#8196;</span> or <span>&emsp13;</span></td></tr>
<tr><td>4-per-em space:</td><td> <span>&#8197;</span> or <span>&emsp14;</span></td></tr>
<tr><td>6-per-em space:</td><td> <span>&#8198;</span></td></tr>
<tr><td>figure space:</td><td> <span>&#8199;</span> or <span>&numsp;</span></td></tr>
<tr><td>punctuation space:</td><td> <span>&#8200;</span>?or <span>&puncsp;</td></tr>
<tr><td>thin space:</td><td> <span>&#8201;</span>?or <span>&thinsp;</span></td></tr>
<tr><td>hair space:</td><td> <span>&#8202;</span>?or <span>&hairsp;</span></td></tr>
</table>