A sawyer will have a totally different view of what QS wood is too, just to add more to the complication. For us luthiers it's best to just refer to it as vertical grain. For a sawyer a cut of wood is only QS when the drums are quartered and then sawn off the quarter. Period.
But for us a center cut slab sawn piece is considered QS because as John mentioned the annular rings are at 90deg. We don't care that it has been properly quartered and sawn just that the lines are vertical, hence just call it vertical grain.
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