title: What's does \e901 mean for the CSS content tag?
body: <p>In our CSS file I see this:</p>
  
  <pre><code>[class*="iconsmall-"]:before {
    font-family: 'icons';
    font-style: normal;
    font-size: 18px;
    padding-left: 5px;
    speak: none;
    font-weight: normal;
    -webkit-font-smoothing: antialiased;
            font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  } 
  
  .iconsmall-unknown:before {content: '\e901';}
  </code></pre>
  
  <p>We have an unknown .svg file.  What does \e901 mean and how does it know that its the unknown.svg file being referenced?</p>
  
  <p>I will a similar situation here with this Code Pen:</p>
  
  <p><a href="https://codepen.io/bungeedesign/pen/XqeLQg" rel="nofollow noreferrer">https://codepen.io/bungeedesign/pen/XqeLQg</a> with \f003 being referenced.</p>