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 21.6.3 Symbols as Denoting Variables
 ------------------------------------
 
 When an unquoted symbol in a Scheme program is evaluated, it is
 interpreted as a variable reference, and the result of the evaluation is
 the appropriate variable's value.
 
    For example, when the expression `(string-length "abcd")' is read
 and evaluated, the sequence of characters `string-length' is read as
 the symbol whose name is "string-length".  This symbol is associated
 with a variable whose value is the procedure that implements string
 length calculation.  Therefore evaluation of the `string-length' symbol
 results in that procedure.
 
    The details of the connection between an unquoted symbol and the
 variable to which it refers are explained elsewhere.  See  Binding
 Constructs, for how associations between symbols and variables are
 created, and  Modules, for how those associations are affected by
 Guile's module system.
 
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