parallel lines are used in the White House. The columns holding it up are parallel lines and the floor and the roof of a room are parallel planes as long as they are the same shape
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Lines of latitude encircle the Earth in an east-to-west direction, and are used in geography. They are called parallels and are parallel to each other and to the equator.
Folding at right angles.
The usual definition is that the lines should be straight. On "alternative geometries", other definitions may be used. For example, on a sphere, the large circles (the largest you can make, whose center is the center of the sphere) replace straight lines. Note that in this case, the normal parallel axiom is no longer valid.
William first used the symbol for parallel.
Well, darling, the symbol for skew lines is an "S" with a slash through it. It's like a big ol' "NOPE" sign for lines that will never meet no matter how much they try. So, if you see that symbol, just accept that those lines are going their separate ways and move on with your life.