Identify an unknown app I really need your help, big time. I searched everywhere and couldn't find an answer to this. Can anyone tell me what app is this? I took a screenshot of the device but it's locked, cannot open Notification Bar.

It's the one that looks like a little Devil face.
What is this app/notification from? I'd really appreciate if anyone knows please share the answer with me.
That app is the Opera VPN app, telling you that you're connected to their VPN service.

Here it is on my phone (third notification icon):





And the matching app (third notification):



For the record, that's a Viking's helmet, not a devil face.

For more on what VPNs are, see Android Authority's relevant article.