Business / Real Estate / Baluster: Any of the vertical supports for a stair, balcony or railing.
Business / Construction / Balusters: Vertical members in a railing used between a top rail and bottom rail or the stair treads. Sometimes referred to as 'pickets' or 'spindles'. MORE
Business / Construction / Balustrade: The rail, posts and vertical balusters along the edge of a stairway or elevated walkway. MORE