(as.info.gz) Symbol Intro

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 3.4 Symbols
 ===========
 
 A "symbol" is one or more characters chosen from the set of all letters
 (both upper and lower case), digits and the three characters `_.$'.  On
 most machines, you can also use `$' in symbol names; exceptions are
 noted in  Machine Dependencies.  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).  
 Symbols.  
 

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