For a long time, I've been feeling confused when I use my smartphone and what the icons there mean (mostly when making choices on it's firewall). On smartphone, the wifi is like , as we all know too.
So, the wifi on ubuntu, shows the same icon that represents the mobile connection on smartphones!!
I just wanted (by showing the obvious) to demonstrate the problem I am having without doubts.
If it is related to the theme I am using, I do not want to change the whole theme, it would just make it complicated to get used to new icons.
So, I need to know where are such signal strenth wifi icons so I can specifically customize them. Even if I have to recompile something :/
It was the oxygen theme that I enabled long ago (since 14.04 upgraded to 16.04) using a "gnome 3 tweak tool".
To fix, I went to configurations for "Appearance" and simply changing from "ambiance (default)" to "radiance" and back to "ambiance (default)" fixed it.
It fixed the main icon on the tray, and also all icons on the dropdown list for connections.
Partial/temporary solution's Limitation
But I am quite lost now, all icons changed.. I got used to the oxygen icon theme, and it is quite cool, now I am trying to find how to re-enable the oxygen theme and just change the wifi singal strength icons.
So, the the main question/request still persists.