Parts of a staircase

Snapped this photo as the evening light cut across the stairs. I was going to title the post spindles but decided to find out what exactly those vertical pieces are called and now I know they’re balusters. (Spindles rest on a horizontal rail.)

Learned lots of new words in the process.

Diagram of stair parts including Inner string (closed), Outer string (open), Tread, Riser, Newel post, Balusters, Banister (or handrail), Return nosing, Fascia, Landing, and Curtail