title: What 'In [*]' mean in jupyter notebook
body: <p>What does <code>In [*]</code> at the upper left-hand of the cell mean when running a jupyter notebook.</p>
  
  <p>I know that when the cell in jupyter notebook has not been run, it shows as <code>In[]</code>, after running the cell, it shows as <code>In[num]</code>. </p>
  
  <p>What about <code>In [*]</code>, does it mean that this cell is running now?</p>
  
  <p><a href="https://i.stack.imgur.com/V2DEu.png" rel="noreferrer"><img src="https://i.stack.imgur.com/V2DEu.png" alt="enter image description here"></a></p>