What is this icon on status bar? I just realized there is new icon in my status bar on left of sound icon



I don't have clue what is that icon, thus I also can't search information about it.

Anyone has advise?
It's the Battery Stamina Mode (Two hands holding the battery). 

 


  Battery STAMINA Mode builds on the same technology as Extended
  Standby Mode. You can turn it off if your dont want it in the
  Power management Settings page.
  
  Starting one minute after the screen has been turned off, data traffic
  is automatically blocked and background activities are prevented from
  waking up the system.
  
  When Battery STAMINA Mode is running, you will also get power
  management tips to help you save even more energy, and keep your
  device going even longer. For example, if Battery STAMINA Mode is
  turned off and you leave your device with the screen turned off for
  six hours or more, you will get a recommendation in the notification
  bar to turn on Battery STAMINA Mode. You will also be notified about
  apps that consume a lot of power. [Ref.]


You can also White list some imporatant apps, thus allowing them to run in the background.

Read More on How battery Stamina Mode works?