What does git [master +2 ~1 -0 !] mean?

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I'm using the "Github For Windows" shell and was trying to commit something and came across what looks like an error:

C:\Path\Name\ [master +2 ~1 -0 !]> 

What does +2 ~1 -0 ! mean?

NOTE: I fixed the error by modifing every file in the directory and re commiting and pushing, now it's just [master], but I still don't understand the numbers.

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