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'Skew lines' is a very broad definition of lines which are 'not parallel, but do not intersect'. They're also not therefore on the same plane. This is a very relevant part of 3D geometry, dealing with the interaction of lines between points in a three dimensional structure. Skew lines are 'normal' lines in these structures, unless one point of their ends is co-planar with another. They can also be used as correlatives when designing structures, because of this requirement for non-co-planar alignments. In architecture, for example, some lines are supposed to be non-co-planar, because they're part of a three dimensional structure.
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