In for example Apple's Aperture, there is a HUD or Head-Up Display. (In Aperture, you activate it by simply typing "H".) This is a display of data on top of the current picture.
The name HUD originally comes from military aircraft. Before the HUD, the pilot had to quickly look down to read indicators, thereby taking attention from the view in front of him. With the HUD, the indicators were displayed on a transparent background just in front of the pilot, so he could read it at the same time as he was looking out the windscreen.
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