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Previous: <a href="Glyphs-for-Programming.html" accesskey="p" rel="prev">Glyphs for Programming</a>, Up: <a href="Insertions.html" accesskey="u" rel="up">Insertions</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Command-and-Variable-Index.html" title="Index" rel="index">Index</a>]
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<h3 class="section">12.10 Inserting Unicode: <code>@U</code></h3>

The command <code>@U{<var>hex</var>}</code> inserts a representation of the
Unicode character U+<var>hex</var>. For example, <code>@U{0132}</code>
inserts the Dutch &lsquo;IJ&rsquo; ligature (&lsquo;&#x0132;&rsquo;).

The <var>hex</var> value should be at least four hex digits; leading zeros
are not added. In general, <var>hex</var> must specify a valid
normal Unicode character; e.g., U+10FFFF (the very last code point) is
invalid by definition, and thus cannot be inserted this way.


<code>@U</code> is useful for inserting occasional glyphs for which Texinfo
has no dedicated command, while allowing the Texinfo source to remain
purely 7-bit ASCII for maximum portability.


This command has many limitations&mdash;the same limitations as inserting
Unicode characters in UTF-8 or another binary form. First and most
importantly, TeX knows nothing about most of Unicode. Supporting
specific additional glyphs upon request is possible, but it&rsquo;s not
viable for <samp>texinfo.tex</samp> to support whole additional scripts
(Japanese, Urdu, &hellip;). The <code>@U</code> command does nothing to
change this. If the specified character is not supported in TeX,
an error is given. (See <a href="_0040documentencoding.html"><code>@documentencoding</code></a>.)



In HTML, XML, and Docbook, the output from <code>@U</code> is always an
entity reference of the form &lsquo;<samp>&amp;#x<var>hex</var>;</samp>&rsquo;, as in
&lsquo;<samp>&amp;#x0132;</samp>&rsquo; for the example above. This should work even when an
HTML document uses some other encoding (say, Latin&nbsp;1) and the
given character is not supported in that encoding.

In Info and plain text, if the output encoding is not UTF-8, the output 
is the ASCII sequence &lsquo;<samp>U+<var>hex</var></samp>&rsquo;, as in the six ASCII characters 
&lsquo;<samp>U+0132</samp>&rsquo; for the example above.

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