[Vwdiesel] What are the various model designations?

[William J Toensing]

I keep seeing references to various VW model designations such as A-1, A-2, B-4, etc. I own a 1981 Dasher, 1980 Dasher, (both wagons) & two '81 Rabbits (both 4 door hatchbacks), all diesels. What are their model designations & what are the other model designations? Apparently Rabbit's, Golf's, Dasher's, Quantum's, Jetta's, Passet's, have their own alpha-numeric designation. If I have this question, perhaps others do as well.