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<h4 class="subsubsection" id="Obsolete-Command-1">6.1.2.5 Obsolete Command</h4>
<p>In <abbr class="acronym">AT&T</abbr> <code class="code">troff</code> output, the writing of a single glyph is
mostly done by a very strange command that combines a horizontal move
and a single character giving the glyph name. It doesn’t have a command
code, but is represented by a 3-character argument consisting of exactly
2 digits and a character.
</p>
<dl class="table">
<dt><var class="var">dd</var><var class="var">g</var></dt>
<dd><p>Move right <var class="var">dd</var> (exactly two decimal digits) basic units ‘<samp class="samp">u</samp>’,
then print glyph <var class="var">g</var> (represented as a single character).
</p>
<p>In GNU <code class="code">troff</code>, arbitrary syntactical space around and within this
command is allowed. Only when a preceding command on the same line ends
with an argument of variable length is a separating space obligatory.
In <abbr class="acronym">AT&T</abbr> <code class="code">troff</code>, large clusters of these and other
commands are used, mostly without spaces; this made such output almost
unreadable.
</p></dd>
</dl>
<p>For modern high-resolution devices, this command does not make sense
because the width of the glyphs can become much larger than two decimal
digits. In <code class="code">gtroff</code>, this is only used for the devices <code class="code">X75</code>,
<code class="code">X75-12</code>, <code class="code">X100</code>, and <code class="code">X100-12</code>. For other devices, the
commands ‘<samp class="samp">t</samp>’ and ‘<samp class="samp">u</samp>’ provide a better functionality.
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