title: What are the U and M file markers in Visual Studio Code?
body: <p><a href="https://i.stack.imgur.com/CXsbZ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/CXsbZ.png" alt="Enter image description here"></a></p>
  
  <p>What do U and M mean in the image? I am using Visual Studio Code and Git. I did some search on the Internet, but I could not find anything on this.</p>