That's the handoff feature. I was using safari on my iPad and could have opened to the same page my iPad was on by swiping up on that icon. Very nice feature if you ask me.
Here's my current setup. It's so nice being able to have eight more icons than before (coming from 4S). I tried to lay them out by category, and ones I use more frequently tend to be on the edges so they're easier to reach. My second home screen is just four folders for apps I use less often.
Just google Apple iPhone 6 home screens and it'll come up on images with loads of others. If no luck message me again and i'll download it to the macbook and post it