The butchers knife has got soaring to new dizzying heights. This knife has been used to do some chopping.
I might speculate that the crenelations represent the jingles to ward off demons during the ritual.
The blade is of a form related the sacrificial knives.
The black wood to associate with kali in the act of destroying the ego.
Sky Burial?
Incidentally the Ram Dao in the link, the figure at the handle end is Shiva with the staff thing in CourseEights post "what did I just buy?" so that Ram dao appears to have Shiva and Kali present not only as the black wood and ivory.