title: What does the X mean in hexadecimal character codes for HTML?
body: <p>The format for a hexadecimal character code in HTML is:</p>
  
  <blockquote>
    <p><code>&amp;#x00;</code></p>
  </blockquote>
  
  <p>... where <code>00</code> is the UTF-8 or ASCII code of the character. </p>
  
  <p>Obviously the <code>&amp;</code> and the <code>;</code> are somewhat arbitrary codes, and the <code>#</code> indicates that a numerical code is being given rather than a text reference like <code>&amp;amp;</code> for ampersand. Without the <code>x</code>, the browser expects a code in decimal format, which makes sense. </p>
  
  <p>But why the <code>x</code> to indicate hexidecimal? </p>