title: Is it a good idea to use unicode symbols as Java identifiers?
body: <p>I have a snippet of code that looks like this:</p>
  
  <pre><code>double Δt = lastPollTime - pollTime;
  double α = 1 - Math.exp(-Δt / τ);
  average += α * (x - average);
  </code></pre>
  
  <p>Just how bad an idea is it to use unicode characters in Java identifiers? Or is this perfectly acceptable?</p>