5x4, numpad stagger:Show Image(http://img193.imageshack.us/img193/720/5x4o.jpg) (http://img193.imageshack.us/i/5x4o.jpg/)
up to this day i have no real idea what to call this, raj does say typematrix has the same layout tooShow Image(http://img510.imageshack.us/img510/9733/typematrix.png) (http://img510.imageshack.us/i/typematrix.png/)
again consensus will figure it out.
Some manufacturers call this XY layout
inward slope, central hump: