Dialog Unit (dlu)
Dialog Unit (dlu) : A unit of relative distance used in computer graphics. Actually there are two units: the horizontal dialog unit equals 1/4 the average width of the font being used, and the vertical dialog unit equals 1/8 the average height of the font. If the font's aspect ratio (the ratio of height to width) is 2:1, these two units will be the same. This is often the case. The unit is used particularly in the design of dialog boxes
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