- Frame: The structural framework surrounding the window opening. - Sash: The movable part of the window that contains the glass and hardware. - Pane: The glass or acrylic sheet within the sash. - Mullion: A vertical or horizontal support that divides the window into sections. - Transom: A horizontal mullion located above the main window opening. - Sidelight: A fixed or operable window located beside the main window opening. - Windowsill: The horizontal ledge at the bottom of the window opening. - Head: The horizontal member at the top of the window opening. - Jamb: The vertical members on either side of the window opening. - Glazing: The sealant applied to hold the glass in place. - Weatherstripping: The material that seals the gaps around the window to prevent air and water infiltration. - Hardware: The mechanical components that operate the window, such as latches, hinges, and cranks. - Flywire: A fine mesh screen that keeps insects out while allowing airflow. - Louver: A series of horizontal or vertical slats that tilt to control ventilation and light. - Casement: A window that swings open on hinges attached to the side. - Awning: A window that hinges at the top and swings outward. - Hopper: A window that hinges at the bottom and swings inward. - Pivot: A window that rotates on a central pivot point. - Sliding: A window that moves horizontally on tracks. - Picture: A fixed window that does not open. - Bay: A window that projects outward from the wall, creating a bay area. - Bow: A series of connected bay windows that create a curved shape.