title: What terminology is used to distinguish between these different types of measurements of running time
body: <p>I see 3 cases for what running time could mean.</p>
  
  <ol>
  <li><p>Big O notation, i.e the running time is O of n^2.</p></li>
  <li><p>Time in basic operations, i.e the running time is 2n or 56</p></li>
  <li><p>Time in milliseconds or seconds, i.e. the running time is 5.42ms or 3s.</p></li>
  </ol>
  
  <p>What terminology can be used to distinguish between these three things? It's confusing when you have a conversation about running time, and you're referring to one of these and the other person is thinking you're referring to another.</p>
  
  <p>Are they all actually called running time? </p>