What is this icon

[userMREHgXAoMW]

 I see this icon often on my notification bar, what does that mean ?

[DarkPhox · Accepted solution]

It means you have data saver mode on and that any app you don't have set to exclude will be blocked from using mobile data in the background
If you want to turn it off:
Settings < connections < data usage < data saver < toggle it off