title: iTunes Connect: How to choose a good SKU?
body: <p>I'm reading the <a href="https://web.archive.org/web/20111020173344/https://itunesconnect.apple.com/docs/iTunesConnect_DeveloperGuide.pdf" rel="noreferrer">iTunes Connect Developer Guide</a> as I'm trying to add a new application to iTunes Connect.  </p>
  
  <p>I'm a bit confused about the <code>SKU number</code> which I should provide. On page 81 in the above developer guide they provide an example of their data for their application <em>Orange Ball</em>.</p>
  
  <p>They have chosen <code>Orange_Ball_01</code> for the <em>SKU Number</em>. What is the <code>01</code> indicating - that it is version 1?  Why use underscore?  Why not just type “OrangeBall”, if that SKU is not used?</p>
  
  <hr>
  
  <p>Update notes:</p>
  
  <ul>
  <li>on January 23rd 2012, Apple changed the above example to <a href="https://web.archive.org/web/20131105212314/https://developer.apple.com/library/ios/documentation/LanguagesUtilities/Conceptual/iTunesConnect_Guide/10_ManagingYourApplications/ManagingYourApplications.html" rel="noreferrer">application "Ball Maze" and SKU "com.apple.com.maze"</a>.</li>
  <li>a few years later, Apple changed the whole documentation, but you may refer to <a href="https://help.apple.com/app-store-connect/#/dev97865727c" rel="noreferrer">https://help.apple.com/app-store-connect/#/dev97865727c</a> for a similar example with application "Adventure App" and SKU "Adventure123".</li>
  </ul>