The term "D" correctly used, describes bows with stacked or "D" shaped limb cross-sections.
I own up to not having checked every reference I have at my disposal, but all books I have checked thru 1989 are consistant in this definition.
Now, if some of you gentlemen would be so kind as to save me some time and provide your references on the "D" being used to describe the braced profile of a bow...it would be appreciated.
I suspect we will find it used in some modern publications, and this provides a good example of how our historical archery language is changing. Someone will use a traditional/historical term incorrectly and from there forward we just automatically accept it as true because "Joe makes bows and he says so."
The truth is, few take the time to trace a term's origin back to find it's beginnings and see for themselves when it evolved as part of our language. And, in many cases, one doesn't travel far before the answer is discovered.