What is this icon meaning above my phone? This is about 3 days I see this icon above my phone(at the left of the alarm icon)! I afraid of it's a non-interested installed app! I tried to find it but couldn't! Also bitdefender anti-virus says your phone is safe!



EDIT: I thought it's better to add another question here instead of creating a new question. 

How can I find what the icons shown in notification bar are for?
It is the Power saving mode active notification icon on Samsung devices. Find out more at Android Central.

Answer to second question: Just swipe down from screen-top. You can see notifications, tap on it, it will open that application. This link shows list of major  notification icons for Samsung devices.