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+<!DOCTYPE html>
+<html>
+<!-- Created by GNU Texinfo 7.0.3, https://www.gnu.org/software/texinfo/ -->
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
+<!-- This manual documents GNU troff version 1.23.0.
+
+Copyright © 1994-2023 Free Software Foundation, Inc.
+
+Permission is granted to copy, distribute and/or modify this document
+under the terms of the GNU Free Documentation License, Version 1.3 or
+any later version published by the Free Software Foundation; with no
+Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
+copy of the license is included in the section entitled "GNU Free
+Documentation License". -->
+<title>Using Fonts (The GNU Troff Manual)</title>
+
+<meta name="description" content="Using Fonts (The GNU Troff Manual)">
+<meta name="keywords" content="Using Fonts (The GNU Troff Manual)">
+<meta name="resource-type" content="document">
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+<meta name="Generator" content="makeinfo">
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+<link href="index.html" rel="start" title="Top">
+<link href="Request-Index.html" rel="index" title="Request Index">
+<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
+<link href="GNU-troff-Reference.html" rel="up" title="GNU troff Reference">
+<link href="Manipulating-Type-Size-and-Vertical-Spacing.html" rel="next" title="Manipulating Type Size and Vertical Spacing">
+<link href="Page-Control.html" rel="prev" title="Page Control">
+
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+</head>
+
+<body lang="en">
+<div class="section-level-extent" id="Using-Fonts">
+<div class="nav-panel">
+<p>
+Next: <a href="Manipulating-Type-Size-and-Vertical-Spacing.html" accesskey="n" rel="next">Manipulating Type Size and Vertical Spacing</a>, Previous: <a href="Page-Control.html" accesskey="p" rel="prev">Page Control</a>, Up: <a href="GNU-troff-Reference.html" accesskey="u" rel="up">GNU <code class="code">troff</code> Reference</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Request-Index.html" title="Index" rel="index">Index</a>]</p>
+</div>
+<hr>
+<h3 class="section" id="Using-Fonts-1">5.19 Using Fonts</h3>
+<a class="index-entry-id" id="index-font"></a>
+
+<a class="index-entry-id" id="index-typeface"></a>
+<a class="index-entry-id" id="index-font-family"></a>
+<a class="index-entry-id" id="index-font-style"></a>
+<a class="index-entry-id" id="index-style_002c-font"></a>
+<a class="index-entry-id" id="index-family_002c-font"></a>
+<a class="index-entry-id" id="index-text-font"></a>
+<a class="index-entry-id" id="index-special-font"></a>
+<a class="index-entry-id" id="index-unstyled-font"></a>
+<a class="index-entry-id" id="index-font_002c-text"></a>
+<a class="index-entry-id" id="index-font_002c-special"></a>
+<a class="index-entry-id" id="index-font_002c-unstyled"></a>
+<p>In digital typography, a <em class="dfn">font</em> is a collection of characters in a
+specific typeface that a device can render as glyphs at a desired
+size.<a class="footnote" id="DOCF72" href="groff.html_fot.html#FOOT72"><sup>72</sup></a> A <code class="code">roff</code> formatter can change typefaces at any
+point in the text. The basic faces are a set of <em class="dfn">styles</em> combining
+upright and slanted shapes with normal and heavy stroke weights:
+&lsquo;<samp class="samp">R</samp>&rsquo;, &lsquo;<samp class="samp">I</samp>&rsquo;, &lsquo;<samp class="samp">B</samp>&rsquo;, and &lsquo;<samp class="samp">BI</samp>&rsquo;&mdash;these stand for
+<i class="slanted">roman</i>, <i class="slanted">italic</i>, <i class="slanted">bold</i>, and
+<i class="slanted">bold-italic</i>. For linguistic text, GNU <code class="code">troff</code> groups
+typefaces into <em class="dfn">families</em> containing each of these
+styles.<a class="footnote" id="DOCF73" href="groff.html_fot.html#FOOT73"><sup>73</sup></a> A <em class="dfn">text font</em> is thus often a family
+combined with a style, but it need not be: consider the <code class="code">ps</code> and
+<code class="code">pdf</code> devices&rsquo; <code class="code">ZCMI</code> (Zapf Chancery Medium italic)&mdash;often,
+no other style of Zapf Chancery Medium is provided. On typesetting
+devices, at least one <em class="dfn">special font</em> is available, comprising
+<em class="dfn">unstyled</em> glyphs for mathematical operators and other purposes.
+</p>
+<a class="index-entry-id" id="index-font-description-file"></a>
+<a class="index-entry-id" id="index-description-file_002c-font"></a>
+<a class="index-entry-id" id="index-file_002c-font-description"></a>
+<a class="index-entry-id" id="index-font-metrics"></a>
+<a class="index-entry-id" id="index-metrics_002c-font"></a>
+<a class="index-entry-id" id="index-mounting-position"></a>
+<a class="index-entry-id" id="index-mounting-position-1"></a>
+<a class="index-entry-id" id="index-position_002c-mounting"></a>
+<p>Like <abbr class="acronym">AT&amp;T</abbr> <code class="code">troff</code>, GNU <code class="code">troff</code> does not itself load
+or manipulate a digital font file;<a class="footnote" id="DOCF74" href="groff.html_fot.html#FOOT74"><sup>74</sup></a> instead it
+works with a <em class="dfn">font description file</em> that characterizes it,
+including its glyph repertoire and the <em class="dfn">metrics</em> (dimensions) of
+each glyph.<a class="footnote" id="DOCF75" href="groff.html_fot.html#FOOT75"><sup>75</sup></a> This
+information permits the formatter to accurately place glyphs with
+respect to each other. Before using a font description, the formatter
+associates it with a <em class="dfn">mounting position</em>, a place in an ordered list
+of available typefaces.
+<a class="index-entry-id" id="index-abstract-font-style"></a>
+<a class="index-entry-id" id="index-font-style_002c-abstract"></a>
+<a class="index-entry-id" id="index-style_002c-font_002c-abstract"></a>
+So that a document need not be strongly coupled to a specific font
+family, in GNU <code class="code">troff</code> an output device can associate a style in
+the abstract sense with a mounting position. Thus the default family
+can be combined with a style dynamically, producing a <em class="dfn">resolved font
+name</em>.
+</p>
+<p>Fonts often have trademarked names, and even Free Software fonts can
+require renaming upon modification. <code class="code">groff</code> maintains a
+convention that a device&rsquo;s serif font family is given the name &lsquo;<samp class="samp">T</samp>&rsquo;
+(&ldquo;Times&rdquo;), its sans-serif family &lsquo;<samp class="samp">H</samp>&rsquo; (&ldquo;Helvetica&rdquo;), and its
+monospaced family &lsquo;<samp class="samp">C</samp>&rsquo; (&ldquo;Courier&rdquo;). Historical inertia has driven
+<code class="code">groff</code>&rsquo;s font identifiers to short uppercase abbreviations of font
+names, as with &lsquo;<samp class="samp">TR</samp>&rsquo;, &lsquo;<samp class="samp">TI</samp>&rsquo;, &lsquo;<samp class="samp">TB</samp>&rsquo;, &lsquo;<samp class="samp">TBI</samp>&rsquo;, and a
+special font &lsquo;<samp class="samp">S</samp>&rsquo;.
+</p>
+<p>The default family used with abstract styles can be changed at any time;
+initially, it is &lsquo;<samp class="samp">T</samp>&rsquo;. Typically, abstract styles are arranged in
+the first four mounting positions in the order shown above. The default
+mounting position, and therefore style, is always &lsquo;<samp class="samp">1</samp>&rsquo; (&lsquo;<samp class="samp">R</samp>&rsquo;).
+By issuing appropriate formatter instructions, you can override these
+defaults before your document writes its first glyph.
+</p>
+<a class="index-entry-id" id="index-graphic-renditions"></a>
+<a class="index-entry-id" id="index-renditions_002c-graphic"></a>
+<a class="index-entry-id" id="index-character-cell-attributes"></a>
+<a class="index-entry-id" id="index-attributes_002c-character-cell"></a>
+<a class="index-entry-id" id="index-cell_002c-character_002c-attributes"></a>
+<p>Terminal output devices cannot change font families and lack special
+fonts. They support style changes by overstriking, or by altering
+ISO&nbsp;6429/ECMA-48 <em class="dfn">graphic renditions</em> (character cell
+attributes).
+</p>
+
+
+<ul class="mini-toc">
+<li><a href="Selecting-Fonts.html" accesskey="1">Selecting Fonts</a></li>
+<li><a href="Font-Families.html" accesskey="2">Font Families</a></li>
+<li><a href="Font-Positions.html" accesskey="3">Font Positions</a></li>
+<li><a href="Using-Symbols.html" accesskey="4">Using Symbols</a></li>
+<li><a href="Character-Classes.html" accesskey="5">Character Classes</a></li>
+<li><a href="Special-Fonts.html" accesskey="6">Special Fonts</a></li>
+<li><a href="Artificial-Fonts.html" accesskey="7">Artificial Fonts</a></li>
+<li><a href="Ligatures-and-Kerning.html" accesskey="8">Ligatures and Kerning</a></li>
+<li><a href="Italic-Corrections.html" accesskey="9">Italic Corrections</a></li>
+<li><a href="Dummy-Characters.html">Dummy Characters</a></li>
+</ul>
+</div>
+<hr>
+<div class="nav-panel">
+<p>
+Next: <a href="Manipulating-Type-Size-and-Vertical-Spacing.html">Manipulating Type Size and Vertical Spacing</a>, Previous: <a href="Page-Control.html">Page Control</a>, Up: <a href="GNU-troff-Reference.html">GNU <code class="code">troff</code> Reference</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Request-Index.html" title="Index" rel="index">Index</a>]</p>
+</div>
+
+
+
+</body>
+</html>