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The term that describes a moulding attached to the active leaf of a pair of doors that overlaps the inactive leaf is known as an astragal. An astragal serves multiple purposes, including providing a seal between the two door leaves, enhancing security by preventing unauthorized access, and improving the overall appearance by creating a finished look between the doors. It typically runs vertically along the edge of the active door and overlaps the inactive door, ensuring that the gap between the doors is minimized. This allows the astragal to function effectively in blocking drafts and light and contributing to sound insulation as well.

Other options may refer to different architectural elements. For example, an architrave is the decorative molding around a door frame, a dividing muntin refers to a vertical element that separates panes of glass in windows, and a transom is typically a horizontal bar located above a door or window, often used to hold glass, and does not involve the interaction of the door leaves themselves in the same way as an astragal does.