title: What is << some text >> in oracle
body: <p>I found this character while reading some blog of pl sql <code>&lt;&lt; some text &gt;&gt;</code> .</p>
  
  <p>I found this character from following blog <a href="http://www.oracle-base.com/articles/8i/collections-8i.php" rel="noreferrer">http://www.oracle-base.com/articles/8i/collections-8i.php</a></p>