 is a 1em &times; 1em square glyph; it is pretty much the same as Ahem's glyph for <code>x</code>
  <li>A blank of 1em &times; 1em
</ul>
<figure>
<img src="img/square_black.svg" width="300">
<img src="img/square_blank.svg" width="300">
</figure>

<p class="note">It might be okay with just using Ahem if tests needing black square only contain codepoints in ASCII-range.
</section>


<section>
<h3>Glyphs to check whether a character is rotated or not</h3>
<p><code>text-combine-upright</code> combines a span of