It's how many new comments there are since you last opened the post. If it says 12 (+2) it means there are 12 comments but last time you opened it there were 10.
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Oh, that's pretty slick.
Wouldn't 2 (+2) mean there are two posts, and both of them are new?
Maybe, but come to think of it, it doesn't occur on all posts so if they're new comments then why don't they appear on every post
Edit: oh I'm dumb. It's on posts I've looked at. So they're new comments since I've seen the post (I think)
It would only show on posts you have previously looked at. So in the 2 (+2) scenario, you previously saw the post when there were no comments, now there are two.
While we are asking about the interface, why is it Frontpage (D). What does the D mean? Sensible answers lol.
It means that is your default feed that loads when you open the app. You can change your default by tapping the vertical ellipses next to each feed.