One of the few "default" applications that do not appear to have a square icon defined is gnome-calendar and gnome-books. Gnome-books could use the Calibre icon, or Calibre-Viewer. I'm not sure on gnome-calendar. Gnome Help also needs one, but I was unable to identify the executable called when launching that.
One of the few "default" applications that do not appear to have a square icon defined is gnome-calendar and gnome-books. Gnome-books could use the Calibre icon, or Calibre-Viewer. I'm not sure on gnome-calendar. Gnome Help also needs one, but I was unable to identify the executable called when launching that.