title: What other operating systems besides Unix is POSIX compatible with?
body: <p>From: <a href="https://en.wikipedia.org/wiki/POSIX" rel="nofollow">https://en.wikipedia.org/wiki/POSIX</a></p>
  
  <blockquote>
    <p>POSIX (/ˈpɒzɪks/ POZ-iks), an acronym for Portable Operating System Interface,[1] is a family of standards specified by the IEEE Computer Society for maintaining compatibility between operating systems. POSIX defines the application programming interface (API), along with command line shells and utility interfaces, for software compatibility with variants of Unix <strong><em>and other operating systems</em></strong>.</p>
  </blockquote>
  
  <p>The problem is that they say clearly "variants of Unix" and "other operating systems".</p>
  
  <p><strong><em>By "other operating systems", which operating systems are they referring to?</em></strong></p>