Jalousie window

A jalousie window (UK: /ˈælʊz/, US: /ˈæləs/), louvred window (Australia, New Zealand, Pacific Islands, Southeast Asia, United Kingdom), jalousie, or jalosy is a window composed of parallel glass, acrylic, or wooden louvres set in a frame. The louvres are joined onto a track so that they may be tilted open and shut in unison to control airflow, usually by turning a crank.