This KS2 maths article explains how parallel lines are always the same distance apart and never meet. A perpendicular line is at right angles to another line.

Overall, however, although the parallel lines of the novel converge, its individual elements fail to cohere. Parallel Lines by Edward St Aubyn Jonathan Cape £20/Knopf $28, 272 pages ...

More than 200 pages into “ Parallel Lines,” Edward St. Aubyn’s second novel in an intellectually roving series about separated-at-birth twins and seemingly everyone they know, one ...