title: <--- and <-> in pseudocode
body: <p>I am not from cs background and I am trying to make sense of what is used for what. In pseudocode I see a lot of this:</p>
  
  <pre><code>for i &lt;---  1 to n-1 do
  j &lt;--- find-Min(A,i,n)
  A[j] &lt;-&gt; A[i]
  end for 
  </code></pre>
  
  <p>What are <code>&lt;---</code> and <code>&lt;-&gt;</code> used to refer to?</p>