Wusthof Nakiri knife
A nakiri is a Japanese vegetable knife. Of course, you can use it to cut anything really, but it is designed for vegetables.
As for hollow ground, there are many meanings. Really, hollow grind should mean picture number 1:
However, many people use the term to describe these dimples
Since you are asking about Wusthof nakiri, then I assume the latter is what you are referring.
For Wusthof, the term "hollow ground" simply means the knife has the dimples, and "fine" means it does not.
Chem's post is right on.
I'll add that in theory, the dimples on the side of the knife are supposed to keep food from sticking to the blade and make the knife cut a bit more easily through certain foods due to decreased drag on the blade.
In practice, the dimples on a Wusthof nakiri aren't going to make much of a noticeable difference from a knife without dimples. A few knives use these dimples (cullens, hollows, whatever) to more noticeable effect, but these knives have much more dramatic implementation of the design. And some other knives manage to keep food from sticking to them or minimize cutting resistance extremely well just by shaping the knife expertly, and not using dimples at all.