I've just rejected an edit for a tag called "ELL".
It doesn't seem right to me that ELU should have or use such a tag, but what do others think?
There are legitimate questions on ELU meta about ELL. I suspect there's a lot of them.
Tagging those questions as being about ELL seems logical. It means that people won't ask questions on meta that have already been answered.
If someone were to tag an ELU main question as belongs-on-ell, that'd be a different matter.