title: In Lua, what is #INF and #IND?
body: <p>I'm fairly new to Lua.  While testing I discovered <code>#INF</code>/<code>#IND</code>.  However, I can't find a good reference that explains it.</p>
  
  <p>What are <code>#INF</code>, <code>#IND</code>, and similar (such as negatives) and how do you generate and use them?</p>