confused by terminology!

I've read number of articles about FL and the terminology used is very
confusing. (and contradictory)

Is a FLV comprised of a number of fuzzy sets or is a fuzzy set
comprised of a number of FLVs?

In other words, Taking the former, I would define HEIGHT as a FLV,
which is comprised of the fuzzy sets: SHORT, MEDIUM and TALL. Is this
the correct terminology?

 (In some literature I've seen SHORT MEDIUM and TALL called FLVs and
HEIGHT the fuzzy set! It's v confusing)

thanks