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<title>Argument Units (The GNU Troff Manual)</title>
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<h4 class="subsubsection" id="Argument-Units-1">6.1.1.2 Argument Units</h4>
<p>Some commands take integer arguments that are assumed to represent
values in a measurement unit, but the letter for the corresponding
scaling unit is not written with the output command arguments. Most
commands assume the scaling unit ‘<samp class="samp">u</samp>’, the basic unit of the device,
some use ‘<samp class="samp">z</samp>’, the scaled point unit of the device, while others,
such as the color commands, expect plain integers.
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<p>Single characters can have the eighth bit set, as can the names of
fonts and special characters. The names of characters and fonts can be
of arbitrary length. A character that is to be printed is always in
the current font.
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which then is regarded as the first character of the next argument or
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