Try http://www.distinctivewooddesigns.com/newelposts.php
newel
One can fasten down a newel post using a screw driver. The screws can be used to fasten the newel post in place. Alternatively bolts can be used for this task.
A bannister post is called a ( Newel Post )
The ball on top of a stair post is commonly referred to as a "newel cap" or "newel ball." It is often decorative and serves to complete the look of the newel post, which is the upright post at the bottom or top of a staircase. Newel caps can come in various styles and materials, contributing to the overall aesthetic of the staircase.
The "legend" is that the blueprints are located inside the newel post in the foyer. No one has ever opened the newel post because it is an original piece to the home that should not be damaged.
a newel post
The newel post as a structural element in staircases dates back to ancient times, but its current form is credited to the Victorian era in the 19th century. While there isn't a single inventor of the newel post, it is commonly associated with the architectural styles of that period.
A 'Newel'
If you're referring a reference in my favorite Christmas movie, try a search for "newel post".
Newel also spelt newell
The post actually is the banister. The fat bit that you slide your hand on is called a handrail or a balustrade.
A newel is part of a staircase and is the vertical post at the foot of a staircase, at angles where the staircase changes direction or around which wind the steps of a circular staircase.