Obscure glass: glass that is made translucent for privacy, decoration, or light diffusion.
Ogee curve: a reverse or concave curved molding.
Operable transom: a panel or window located above a door, which can be opened for ventilation.
Operator: hand crank, gearbox, and arm assembly used to open and close windows such as jalousie windows.
Oriel window: a window which projects out from an exterior wall, similar to a bay window except it is supported by the wall and doesn't extend to the ground.
Outer frame member: the part of the window frame that extends beyond the outer wall.
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