What is a "shell semi environment"?
I was recently reading a Wikipedia page about the Enlightenment desktop environment for Linux and it was comparing it to other desktop environments and listed it as a "shell semi environment". It was basically implying that it is not a full desktop environment like Gnome, KDE, XFCE or LXDE nor a tiling manager such as Awesome, i3 nor a stacking window manager like Openbox, Fluxbox or IceWM. If it is none of these things, what exactly is it? What exaclty is a "shell semi environment", I have never heard of such a thing.
Also, are there any others or is Enlightenment the only one?