title: How can I use system icons
body: <p>Im totally new to Android development.</p>
  
  <p>I would like to use buttons/images like these:</p>
  
  <p><img src="https://i.stack.imgur.com/zC6OJ.png" alt="enter image description here"></p>
  
  <p>in my application. I don't want to reproduce them (create new png files etc.).
  I guess resources like these are somewhere in Android.</p>
  
  <ol>
  <li><p>How I can use them?</p></li>
  <li><p>Is this common in Android Development to rely on system built-in images?</p></li>
  </ol>