Strange symbol in Xcode4 navigator

I would know what this symbol should mean 开发者_开发问答?

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If you have set up your project with a source code manager (Git repository) you can have different symbols in the navigator depending on the state of the file. Source code manager status is shown as a badge in the project navigator, as follows:

M = Locally modified

U = Updated in repository

A = Locally added

D = Locally deleted

I = Ignored

R = Replaced in the repository