logical twip
A unit of distance, based on twips, that when printed, equals one twip. This ensures that placement and proportion of screen elements in your screen application display the same on all systems.
 
A twip is a unit of length equal to 1/20 of a printer's point, and a printer's point is 1/72 of an inch. There are approximately 1440 twips to a logical inch or 567 twips to a logical centimeter (the length of a screen item measuring one inch or one centimeter when printed).
 
Any absolute unit of measurement, such as inches, centimeters, or twips, is not necessarily consistent when dealing with external devices such as monitors or printers. If, for example, you programmatically draw a one inch line on a monitor, measure it with a ruler to ensure that it is one inch, then switch to a larger monitor, the line will no longer be one inch. Therefore, one logical twip may consist of one or more twips.