What is the symbol with a circle and a plus sign on the top status bar on phone

[AC Question]

There is a circle with a plus sign inside the circle on top of my status bar what's that symbol stand for

 

[Sam_Gs7]

According with replies in this AC-Thread is a -Saver data- icon in
Nexus phone,.Do you've -1 of those.? If not disregard the reply
don't know if is coommon in other-Android phones: Cya

Link: http://forums.androidcentral.com/android-7-0-nougat/726282-what-circle-plus-sign-symbol-mean.html

 

[hallux]

@Sam_Gs7 - spot on, it's the Data Saver icon, a feature in Nougat so it's likely on most/all devices running Nougat.