Panel:Usually refers to the glazed panel or panels in a window or door frame.
Pane: A sheet of glass for glazing a window or door.
Palladian windows: A combination of three windows where the center window is tall and arched and the two on the outside are rectangular, and match each other in design.
Parting stop:The thin strip on each jamb that separates the sash of a double-hung window.
Picture window: A large fixed window.
Pivot window:A window that opens by pivot points between the sash and frame.
Prime Sash: The balanced or moving sash of a window unit.
Projected Window: An awning-type window that swings either inwards or outwards at the top or the bottom.