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14.8.6 '@equiv{}' (==): Indicating Equivalence
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Sometimes two expressions produce identical results.  You can indicate
the exact equivalence of two forms with the '@equiv{}' command.  The
'@equiv{}' command is displayed as '==', either a standard mathematical
equivalence sign (three parallel horizontal lines) or (when that is not
available) as the ASCII sequence '=='.

  Thus,

     @lisp
     (make-sparse-keymap) @equiv{} (list 'keymap)
     @end lisp

produces

     (make-sparse-keymap) == (list 'keymap)

This indicates that evaluating '(make-sparse-keymap)' produces identical
results to evaluating '(list 'keymap)'.