Shutter
From Freepedia
A shutter is a movable cover or screen that alternately prevents and permits the passage of some desirable (or undesirable) element:
- A window shutter is a door for covering a window, or a decoration of similar appearance added for visual appeal.
- In pipe organs, a shutter prevents or allows air to pass through the pipes, producing the desired sounds.
- A shutter (photography) is a photographic device that administers the exposure by admitting light to the film for a specific period of time.
