The stool is the flat shelf at the bottom of the window on the inside. It sits
against the sill, and the lower sash closes down behind its inner edge. It is
the part people put plants on and call the windowsill.
The ends of the stool that extend past the side casings are called horns.
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Awning window, from inside
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Casement window, from inside
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Double-hung window, from inside
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Two double-hung windows in one opening
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Double-hung window, in section
Related
SillThe bottom member of the window frame, sloped outward to shed water.
ApronThe trim board on the wall directly beneath the stool.
CasingThe molding that frames the window on the interior wall.
HornThe end of a sill or stool that extends past the side casings.