Passive solar collector: a South-facing panel of glazing, either wall or roof-mounted, which absorbs heat from the sun’s without any active heat storage or distribution system.

Palladian window: a square or rectangular window with a semi-circular section on top and smaller windows on each side.

Picture frame casing (full bound casing): the use of picture frame trim to completely surround the inside surface of the window frame. This replaces the stool and apron on the bottom.

Picture window: a large fixed window.

Pitch: the slope of a roof, usually expressed in rise/span, for instance, a 3/12 pitch has 3 inches of rise for every 12 inches horizontal span.

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