Recently I saw this like "Count label" on tabs of SourceTree. What is this meaning do you know?
I already search for that on the internet. But I couldn't find the specific information.

Check with a git status in command line: this might be the number of commit you are ahead/behind compared to your remote repository.
In your case: 3 local commits not yet pushed.
Note: the tabs in SourceTree 2.x sparked a "lively" debate: (as in "people hated it"), and the recent SourceTree 3.x still has issues SRCTREEWIN-7176.
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