title: What is the "M" on this file in Xcode?
body: <p><a href="https://i.stack.imgur.com/aiofP.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/aiofP.png" alt="enter image description here"></a></p>
  
  <p>These two "M" next to the file names, what are they for? How do I get rid of it? Do I need it?</p>