title: What is List[String~Int]?
body: <p>While going through the scala documentation (<a href="http://www.playframework.org/documentation/2.0/ScalaAnorm" rel="noreferrer">Play Docs</a>) of the play framework I saw a syntax I have never seen before.</p>
  
  <pre><code>val populations:List[String~Int] = {
    SQL("select * from Country").as( str("name") ~ int("population") * ) 
  }
  </code></pre>
  
  <p>Could someone please tell me what does <strong>"~"</strong> in <code>List[String~Int]</code> mean?</p>