Question: what are the names of the parts of stairs?
Answer: Spindles—the vertical supports that sit between a handrail and base rail. Also known as a balustrade. ... 
Base rail—sits on top of the string or along a landing. ... 
Handrail—a rail that sits on top of the baluster/spindles. ... 
Newel post—the vertical post that supports the handrail at the top and bottom of the stairs.