as: Symbol Intro

1 
1 3.4 Symbols
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1 A "symbol" is one or more characters chosen from the set of all letters
1 (both upper and lower case), digits and the three characters '_.$'.  On
1 most machines, you can also use '$' in symbol names; exceptions are
1 noted in ⇒Machine Dependencies.  No symbol may begin with a
1 digit.  Case is significant.  There is no length limit; all characters
1 are significant.  Multibyte characters are supported.  Symbols are
1 delimited by characters not in that set, or by the beginning of a file
1 (since the source program must end with a newline, the end of a file is
1 not a possible symbol delimiter).  ⇒Symbols.
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1    Symbol names may also be enclosed in double quote '"' characters.  In
1 such cases any characters are allowed, except for the NUL character.  If
1 a double quote character is to be included in the symbol name it must be
1 preceeded by a backslash '\' character.
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