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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 |
| ‘<samp><span class="samp">_.$</span></samp>’. |
| On most machines, you can also use <code>$</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>. |
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