*Structure of the '''attachment''' site, for example forming a joint with a certain metacarpal/metatarsal or phalangeal bone.
:*'''Fusion''' of even the distal parts of a supernumerary digit (syndactyly) is called polysyndactyly.<ref>{{cite web|url=https://radiopaedia.org/articles/polysyndactyly?lang=us|title=Polysyndactyly|author=Dr Mark Thurston|website=Radiopaedia|accessdate=2019-01-28}}</ref>
*'''Angulation''' of the most proximal part of the supernumerary digit, usually described as mild/moderate/severe valgus or varus and not necessarily numerically.
*Any '''other abnormality''' in the projected skeleton, since the condition is associated with many syndromes.<ref name=radiopaedia/>
It is also appreciated to state:
*'''Angulation''' of the most proximal part of the supernumerary digit.
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