Q:

Intellij Code Symbol in Margin

Can someone tell me what the rectangular symbol in the margin, right above the breakpoint, means?  I want to turn it off, but I am not sure what it is called.
This is Intellij 13.  Thanks.

A:

This means that this file's line has been modified locally.  It's being compared to your version control system.  In this case, it probably means you added a newline here.  
There might be a better way than this to turn it off, but I haven't found it: Go to Settings -> Version Control.  From there click on the VCS tab and choose <none>.  This, of course, will remove all your VCS integration so it's pretty heavy handed.  Here's a screenshot:

