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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>hairy</title><link rel="stylesheet" href="../../jargon.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.61.0"/><link rel="home" href="../index.html" title="The Jargon File"/><link rel="up" href="../H.html" title="H"/><link rel="previous" href="hairball.html" title="hairball"/><link rel="next" href="HAKMEM.html" title="HAKMEM"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">hairy</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="hairball.html">Prev</a> </td><th width="60%" align="center">H</th><td width="20%" align="right"> <a accesskey="n" href="HAKMEM.html">Next</a></td></tr></table><hr/></div><dt><a id="hairy"/><dt xmlns="" id="hairy"><b>hairy</b>: <span xmlns="http://www.w3.org/1999/xhtml" class="grammar">adj.</span></dt></dt><dd><p> 1. Annoyingly complicated. &#8220;<span class="quote"><a href="../D/DWIM.html"><i class="glossterm">DWIM</i></a> is
incredibly hairy.</span>&#8221; </p></dd><dd><p> 2. Incomprehensible. &#8220;<span class="quote"><a href="../D/DWIM.html"><i class="glossterm">DWIM</i></a> is
incredibly hairy.</span>&#8221; </p></dd><dd><p> 3. Of people, high-powered, authoritative, rare, expert, and/or
incomprehensible. Hard to explain except in context: &#8220;<span class="quote">He knows this
hairy lawyer who says there's nothing to worry about.</span>&#8221; See also
<a href="hirsute.html"><i class="glossterm">hirsute</i></a>.</p></dd><dd><p>There is a theorem in simplicial homology theory which states that
any continuous tangent field on a 2-sphere is null at least in a point.
Mathematically literate hackers tend to associate the term
&#8216;hairy&#8217; with the informal version of this theorem; &#8220;<span class="quote">You
can't comb a hairy ball smooth.</span>&#8221; (Previous versions of this entry
associating the above informal statement with the Brouwer fixed-point
theorem were incorrect.)</p><p>The adjective &#8216;long-haired&#8217; is well-attested to have been
in slang use among scientists and engineers during the early 1950s; it was
equivalent to modern <span class="firstterm">hairy</span> senses 1
and 2, and was very likely ancestral to the hackish use. In fact the noun
&#8216;long-hair&#8217; was at the time used to describe a person
satisfying sense 3. Both senses probably passed out of use when long hair
was adopted as a signature trait by the 1960s counterculture, leaving
hackish <span class="firstterm">hairy</span> as a sort of stunted
mutant relic.</p><p>In British mainstream use, &#8220;<span class="quote">hairy</span>&#8221; means
&#8220;<span class="quote">dangerous</span>&#8221;, and consequently, in British programming terms,
&#8220;<span class="quote">hairy</span>&#8221; may be used to denote complicated and/or
incomprehensible code, but only if that complexity or incomprehesiveness is
also considered dangerous.</p></dd><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="hairball.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="../H.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="HAKMEM.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">hairball </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> HAKMEM</td></tr></table></div></body></html>