title: How many Unicode encodings are there, and are all of them still in use?
body: <p>I know of the following Unicode encodings:</p>
  
  <ul>
  <li>UTF-7</li>
  <li>UTF-8</li>
  <li>UTF-16</li>
  <li>UTF-32</li>
  <li>UCS-2</li>
  </ul>
  
  <p>Are there more Unicode encodings? And are all of the Unicode encodings still in use, or are some of them now obsolete?</p>