title: In Ruby on Rails view templates what does "<%_" and mean?
body: <p>I am familiar with:</p>
  
  <pre><code>&lt;%= var  %&gt;  # rails output
  </code></pre>
  
  <p>and</p>
  
  <p><code>&lt;%- method %&gt;</code>  # to execute ruby code without any output</p>
  
  <p>Now I am also seeing view templates with</p>
  
  <pre><code>&lt;%_ final_cost %&gt;
  </code></pre>
  
  <p>What does the underscore mean?</p>