I've got a so-called "Smart" TV. Nothing could be further from the truth, but that's another issue.
I get a similar icon topp left of my screen from time to time. It's like a globe with an arrow wrapped round it. Similarly there is no mention of it in my user manual. Somebody told me it's something to do with the TV's interaction with the internet. Even if that's true I don't know why I would want to know what it was doing. Whoever designed the mechanism that puts it there was wasting their time.