title: What is the meaning of $H in Javascript/JQuery?
body: <p><a href="http://jsfiddle.net/zalun/QsHw4/" rel="nofollow">This jsfiddle.net example</a> includes <code>$H</code>:</p>
  
  <pre><code>new Request.JSON({
      url: '/echo/json/',
      data: {
          json: JSON.encode({
              text: 'some text',
              array: [1, 2, 'three'],
              object: {
                  par1: 'another text',
                  par2: [3, 2, 'one'],
                  par3: {}
              }
          }),
          delay: 3
      },
      onSuccess: function(response) {
          show_response(response, $('post'));
      }
  }).send();
  
  show_response = function(obj, result) {
      $H(obj).each(function(v, k) {
          new Element('li', {
              text: k + ': ' + v
          }).inject(result);
      });
      result.highlight();
  };
  </code></pre>
  
  <p>I can't seem to find the meaning/function of $H.  Can someone elaborate?</p>