title: How to safely encode µ or the micro-symbol into an NSString programmatically?
body: <p>I need a representation of µ or "micro". That funny small u with the long tail on the left side. Maybe you can see it here: µ</p>
  
  <p>Some weeks ago I was reading in the docs, that it's a bad idea to type any special characters into the source code. So to prevent problems, could I encode that special character µ somehow like web folks do with &nbsp;, in an NSString? And if so, is there an overview of these codes or a way to get the correct code?</p>