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(librep.info)Self-Evaluating Forms

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Self-Evaluating Forms
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   The computed value of any form which is not a symbol or a list will
simply be the form itself and the form is said to be a "self-evaluating
form".

   Usually the only forms to be evaluated in this way will be numbers,
strings and vectors (since they are the only other data types which
have read syntaxes) but the effect is the same for other types of data.

   This means that forms you know are self-evaluating do not have to be
quoted to be used as constants (like lists and symbols do).

     "foo"
         => "foo"