Window Jamb
On a window that the jambs are the vertical structural elements (articles) of the overall frame. They’re about the left and right surfaces of the window frame.
Chris Hill
The jamb could be detailed or simple.
Jordan Parnass Digital Architecture
These jambs, in addition to the remainder of the window frame’s bits, are extended to create a deeper look.
Karen Joy Interiors
Window jambs are often barely visible.