closed window
Computing term for a window that is not open or active; may refer to a window that has been closed by the user or is in a closed state.
To reopen a closed window, click the icon on the taskbar.
Compound of 閉塞 (へいそく, 'closure, blockage') and ウィンドウ ('window'), a direct calque from English 'closed window' in computing contexts.