What is the meaning of + icon in status line

[AC Question]

Recently appeared on the top right of screen, nearby the time. A white plus sign in the center and a white 3/4 of a circle around it - the top right quarter of the circle is dark.

I use Nexus 6P with Android 7.1.1

Is there a place where I can see the meaning of all icons?

 

[hallux]

That's the data saver. You can test this by going to Settings > Data Usage > Data Saver and toggling the switch there and watch the icon disappear and appear as you toggle it.

Android 7.0: Data Saver will prevent overages on cheaper plans | Android Central

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[shaffavi]

Thanks a lot hallux, I was the one asking the question and your answer definitely explains the "sudden" appearance of this icon since I did recently turned the data saver on.

Now I'm much more relaxed thanks again!