pane

This term describes a flat, rectangular surface, typically transparent or digital, that serves as a structural or organizational unit. In physical architecture, it refers specifically to the glass inserts of a window, distinguishing the individual sheet from the entire window frame. In computing, the word describes a divided section of a user interface. This usage emphasizes the partitioning of a screen into distinct, functional areas, such as a navigation pane or a preview pane, allowing for simultaneous viewing of different data sets.