I have two questions about the mode line.

1. In my mode line, to the left of where it described the current modes e.g. (Org company), there is text that looks like [#] or sometimes [i,#], where the i and # signs are highlighted.

I don't think this is a stock emacs feature as I can't find in the docs what it means.

2. To the left of the above, the mode line mentions Git:master. I have not installed any git related packages. Further, when I look at the currently running modes, I do not see anything that mentions git or version control. I also do not see in the manual anything that mentions out of the box git integration. I'm wondering what I might have done to enable this.