What is the sign that there is a + in the original in the Galaxy s8?

I was using iPhone and came to Galaxy S8 this time.

There are different notification windows above, so I have a lot of questions.

What is the mark of the original + in Galaxy s8?

The original color is not painted entirely, but a part of it feels like a capacity.

I thought it was a battery mark, but I'm curious because it doesn't seem like it.

926 2017-08-09 Gentleman

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