title: Qt, use of "&" in tr
body: <p>I'm going through the Qt5 Application <a href="http://qt-project.org/doc/qt-5/qtwidgets-mainwindows-application-example.html" rel="nofollow">tutorial</a>. In the creation of actions, I keep seeing the usage of "&amp;" like the follwoing:</p>
  
  <pre><code>newAct = new QAction(QIcon(":/images/new.png"), tr("&amp;New"), this)
  ...
  openAct = new QAction(QIcon(":/images/open.png"), tr("&amp;Open..."), this);
  ...
  enter code exitAct = new QAction(tr("E&amp;xit"), this);
  ...
  </code></pre>
  
  <p>I can't seem to find why these "&amp;" are used, the Qt documentations on tr uses these notations without explaining what they are for. Further, when I deleted the "&amp;" symbol, the resulting application doesn't seem to change at all.</p>