While the original technical, performance based, definition of a choke name: skeet, IC, mod, etc. may be pattern percentage, it has become a bit of an enigma in the days of mass produced guns and variety of available loads. The measurement definition is more practical to compare guns with, to produce guns, and to buy replaceable chokes. But it can't stand alone without some performance based definition either. So, we live with this debateable middle ground, the purist definition and the practical definition, and we debate it regularly.
How about "Duck1" and "Duck2"? How would that differ from "Goose1" and "Goose2"?
Me? I want a "Limit1" and "Limit2" choked gun.