Newel Base
A newel base is the bottom part of a newel post, which is the vertical support pillar in a staircase.
The newel base is the section that is anchored to the floor or the stair tread.
It provides a stable foundation for the newel post & helps ensure that the newel post is securely attached and can bear the load and stress placed on the staircase, particularly at the points where the railing turns or ends.