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<div class="moz-cite-prefix">I'm not sure if I understand the
question.<br>
<br>
Denoting and styling ranges of emphasis is not governed by Unicode
itself, being a matter of higher-level protocols including but not
limited to HTML/CSS, RTF, ECMA-48, IPTC 7901 and the myriad
dialects of Markdown and Wikitext.<br>
<br>
In some contexts, stylised forms of a letter (e.g. blackletter)
might be given a special meaning in a particular context; some
such forms are included in Unicode in the Letterlike Symbols and
Mathematical Alphanumeric Symbols blocks, and some (including
blackletter) have HTML5 entities inherited from ISO 9573-13.<span class="nowrap"><span class="monospaced"> </span></span>
Mathematical Alphanumeric Symbols likewise includes e.g. bold
serif, italic serif and bold italic serif forms of the Basic Latin
alphabet letters.<span class="nowrap"><span class="monospaced"> </span></span>
While there might be a tendency in the wild to use these to
stylise text where markup is unavailable, this is not really
orthopraxic and (in more pragmatic terms) tends to be poorly
supported by older devices and also assistive technology (although
since they compatibility-decompose to the ASCII letters, it is
theoretically <i>possible</i> for assistive technology to support
this, which cannot be said of some other novelty stylisations with
lookalike characters).<br>
<br>
The underlining is available as a combining character (<span class="nowrap"><span class="monospaced">U+0332</span></span><span class="nowrap"><span class="monospaced">). This is essentially
a nonspacing version of the ASCII underscore, and can be
applied if an underlined version of a symbol distinct from the
plain symbol is needed for some purpose. Underlining an entire
block of text that way is likely to have subpar results, and
should generally be done with higher level markup instead.</span></span><span class="nowrap"><span class="monospaced"> And yes, this can be
applied to Mathematical Alphanumeric Symbols characters if
(say) a bold underlined sans-serif R is being used as a
particular symbol for something, i.e. </span></span>𝙍̲.<br>
<br>
David Chmelik via Unicode wrote:<br>
</div>
<blockquote type="cite" cite="mid:teicnd$pm3$2@ciao.gmane.io">
<pre class="moz-quote-pre" wrap="">I know unicode does bold, italic, underline, but does it do them all at
once?
</pre>
</blockquote>
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