Sash: the window insert that contains the panes, either movable or fixed to the frame.
Sash lock: a cam lock located on the upper rail of the lower sash, with a mating receptacle on the bottom rail of the upper sash.
Sidelights: narrow windows mounted on one or both sides of an entry door. These can be fixed or operable.
Single-hung Window: same as double-hung except that the upper sash is fixed.
Sill: a flat, horizontally-mounted board that forms a shelf at the bottom of the inner window frame.
Skylight: a roof-mounted window that provides light through the ceiling into a room. A skylight can be "fixed" or "operable" for ventilation.
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