I want to know the meaning of the letters in the project navigator in Xcode; (Ms & A) 
Letters in Xcode Project Navigator
xcode
Related Solutions
There is no a way to do this in Xcode. It must be related to the project or workspace. It even does this if you deselect the target.
It sounds like what you need is a text editor and not an IDE like XCode since XCode is built for OS X and iOS development primarily. You may want to try TextWrangle for free, or it's purchasable counter part BBEdit.
If your doing C/C++, Python or PHP work, you may want to try some of the other JetBrains products like AppCode, PyCharm or PHPStorm. There is also Eclipse, with it's many plugins, the heavy favorite amongst many developers.
In most cases, you can determine it by looking at the Story Board (*.storyboard, often * is Main).
Here we see the possible templates.
Then, how the typical story board layout looks for the...
Master-Detail Application
Page-Based Application
Single View Application
Tabbed Application
Game (which also features SpriteKit framework)
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Best Answer
These are for source control. M stands for Modified. A stands for Added. This is so you know what files have changed since the last commit of your project.
It's all explained on this support page http://developer.apple.com/library/mac/documentation/ToolsLanguages/Conceptual/Xcode4UserGuide/SCM/SCM.html