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Thanks Joe. That was one instance I was iffy about when it comes to nomenclature.

Here's some interesting info coming from Arthur E. Boon:

http://www.en.nassrasur.com/razorcentral/grind.html
This will give you an idea of the belly that I was talking about.
...

I am actually a bit unclear on this because a blade can be fully hollowed out without being bi-concave, but maybe that would not be a stable configuration and would create too much flex if it reached...

Even though CS describes razors of this configuration as fully hollowed, this one feels stiffer and doesn't look bi-concave. Generally when I refer to full hollows I refer to biconcave grinds.

It just means sub-zero, so I'm assuming it's ice-hardened. I own a doble temple (double-tempered) half hollow which gives me amazing shaves.