If there's a technical term for this, I don't know what it is. However, I had a small clamp where the end piece was missing, so I modelled this up in TinkerCad.
NOTE: Print vertically on the short edge with support material. This makes the part stronger; when I tried printing it flat, it would snap every time I would try to put this on the clamp.
The author hasn't provided the model origin yet.