Second, there is the little recycle symbol. Use that to read it later. It recycles the post into your feed and you can see it again when you scroll up.

Third, the star. Everyone knows what that is for, to mark things as read. Once you tap it you don't have to read it again in your feed when it's lit up.

Fourth, the downward-facing rectangular pacman guy? I think that's broken.

Finally, three dots. I think this is food for the rectangular pacman but I can't get him to turn and eat them.