Strange icon/symbol Samsung Galaxy J2

Hi everyone!

A strange symbol appeard on my screen 2 days ago and I have no idea what it is.
It isn't an app because when I swype down I don't see an app thats open and I haven't downloaded anything new.
It's not there on the screen where you log in with your code but after logging in it's there continually.
Do you have any idea what it could be??
Attached is a screenshot of the icon.

Thanks!

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