1.4.1 Literal Expressions

Literal constants may be written by using an external representation of the data. In general, the external representation must be quoted (see Quoting); but some external representations can be used without quotation.

     "abc"                                     "abc"
     145932                                    145932
     #t                                        #t
     #\a                                       #\a

The external representation of numeric constants, string constants, character constants, and boolean constants evaluate to the constants themselves. Symbols, pairs, lists, and vectors require quoting.