title: What does Z in Verilog stand for?
body: <p>I've recently found a code like this in a Verilog code that I'm referring to write finite state machine.</p>
  <pre><code>reg [15:0]Bus;
  Bus = 'bzzzzzzzzzzzz1111;
  </code></pre>
  <p>What is the meaning of <code>z</code> here?</p>