(octave.info)Evaluation Notation

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1.3.2 Evaluation Notation
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In the examples in this manual, results from expressions that you
evaluate are indicated with ‘⇒’.  For example:

     sqrt (2)
          ⇒ 1.4142

You can read this as “‘sqrt (2)’ evaluates to 1.4142”.

   In some cases, matrix values that are returned by expressions are
displayed like this

     [1, 2; 3, 4] == [1, 3; 2, 4]
          ⇒ [ 1, 0; 0, 1 ]

and in other cases, they are displayed like this

     eye (3)
          ⇒  1  0  0
              0  1  0
              0  0  1

in order to clearly show the structure of the result.

   Sometimes to help describe one expression, another expression is
shown that produces identical results.  The exact equivalence of
expressions is indicated with ‘≡’.  For example:

     rot90 ([1, 2; 3, 4], -1)
     ≡
     rot90 ([1, 2; 3, 4], 3)
     ≡
     rot90 ([1, 2; 3, 4], 7)