Xcode letters beside files in Project Navigator

Solution 1:

Those letters beside files in the Project Navigator of Xcode show the status of files that are under version control systems, such as SVN or Git. So, for instance:

• M - means the file has changed and it should be merged into SCM
• A - means this is a new file and should be added to SCM
• U - means this is a newer version of a file on SCM and you need to update it
• ? - means the file has not been added to source control
• etc...

P.S. You can find list of statuses (at least for SVN) here

Solution 2:

A - Added (This is a new file that has been added to the repository)

C - Conflict (There is a conflict in the file)

D - Deleted (a file has been deleted)

M - Modified (An existing file has been changed)

R - Renamed (The file has been renamed)

U - Untracked (The file is new or has been changed but has not been added to the repository yet)