Personally, I'm pretty sure the diagram refers to the process and not the end result. I prefer to just say horizontal grain or vertical grain, though grain at a bias I'd still call rift. Because, obviously, a log flatsawn will have one board cut through the center and will be perfectly "quartered" even though the process was flatsawing, while slicing a quartered log will yield one perfectly "quartered" board and others of varying degrees of rift.
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