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(librep.info)Keyword Symbols

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Keyword Symbols
---------------

   Keywords are a special class of symbols. They evaluate to themselves,
and have the read syntax `#:SYMBOL', where SYMBOL is anything
satisfying the usual symbol syntax. These objects are normally used to
mark keyword parameters in function applications (Note: Lambda
Expressions).

 - Function: make-keyword symbol
     Return the keyword symbol that could be used to mark an argument
     value for the keyword parameter SYMBOL.

          (make-keyword 'x)
              => #:x

 - Function: keywordp arg
     Returns true if ARG is a keyword symbol.