title: What does ClassName < :: imply in ruby?
body: <p>I saw this line of code.</p>
  
  <pre><code>class ClassName &lt; ::TestUnit::Test::Etc
  </code></pre>
  
  <p>What does it mean when the nested-constant marker follows the inheritance symbol, like so: <code>&lt; ::SuperClass</code>?</p>
  
  <p>Also, is there a technical name for the <code>::</code> symbol? </p>