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<h3 class="section">3.4 Symbols</h3>

<p><a name="index-characters-used-in-symbols-128"></a>A <dfn>symbol</dfn> is one or more characters chosen from the set of all
letters (both upper and lower case), digits and the three characters
&lsquo;<samp><span class="samp">_.$</span></samp>&rsquo;. 
On most machines, you can also use <code>$</code> in symbol names; exceptions
are noted in <a href="Machine-Dependencies.html#Machine-Dependencies">Machine Dependencies</a>. 
No symbol may begin with a digit.  Case is significant. 
There is no length limit: all characters are significant.  Symbols are
delimited by characters not in that set, or by the beginning of a file
(since the source program must end with a newline, the end of a file is
not a possible symbol delimiter).  See <a href="Symbols.html#Symbols">Symbols</a>. 
<a name="index-length-of-symbols-129"></a>

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