<DT>
<STRONG>
Below Box</STRONG>
</DT><DD>Normally, the bottom of the font box, the bottommost limit of a font, is 1/4 of the font's height below the baseline. For those fonts which do not follow this rule, the Below Box metric is the number of points by which the true font box extends below the normal font box.</DD>
<DT>
<STRONG>
Mean</STRONG>
</DT><DD>The height of a typical lower case character. This metric is sometimes called the &quot;x height,&quot; since this will be the height of a lower case &quot;