Wherever an example of evaluating a Lisp form is shown it will be formatted like this,
(+ 1 2)
=> 3
The glyph `=>' is used to show the computed value of a form.
When two forms are shown as being exactly equivalent to one another the glyph `==' is used, for example,
(car some-variable) == (nth 0 some-variable)
Evaluating some forms result in an error being signalled, this is denoted by the `error-->' glyph.
(read-file "/tmp/foo")
error--> File error: No such file or directory, /tmp/foo
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