title: What math operation comes after exponentiation (^)?
body: <p>Let's give expressions some names:</p>
  
  <pre><code>x+3 = x+1+1+1 // lvl 1
  x*3 = x+x+x   // lvl 2
  x^3 = x*x*x   // lvl 3
  </code></pre>
  
  <p><strong>What would be</strong> the mathematical <strong><em>term / real name / topic</em></strong> for <strong>lvl</strong>s after 3?</p>
  
  <p>Like:</p>
  
  <pre><code>x (lvl 4 operation) 3 = x^x^x
  x (lvl 5 operation) 3 = x(lvl 4 operation)x(lvl 4 operation)x
  ..
  </code></pre>
  
  <p>Thanks in advance.</p>
  
  <p><em>P.S. Above are not programming codes/languages</em></p>