title: How many bytes do we need to store an arabic character
body: <p>I'm a little confused about the storage needed for representing an arabic character.</p>
  
  <p>Please let me know if this is true:</p>
  
  <ul>
  <li>in ISO/IEC 8859-6 encoding it takes 2 bytes (http://en.wikipedia.org/wiki/ISO/IEC_8859-6)</li>
  <li>in UNICODE it takes 4 bytes (http://en.wikipedia.org/wiki/Arabic_Unicode)</li>
  </ul>
  
  <p>What are the advantages of each encoding? When should we prefer one over another one?</p>