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



   <p>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

<code>_.$</code>. 

On most machines, you can also use <code>$</code> in symbol names; exceptions

are noted in <a href="Machine-Dependencies.html#Machine%20Dependencies">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>.



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