A screen memory.
Something intended to conceal the true nature, especially of an activity; a subterfuge.
The definition of a cover is something that goes over, rests on the surface or provides a place to hide.
Any of various devices used to reduce or screen light or heat:
Find another word for shutter. In this page you can discover 13 synonyms, antonyms, idiomatic expressions, and related words for shutter, like: grille, prontor, louvered, louver, knob, roll down, storm shutter, curtain, screen, aperture and blind.