"A distortion in the mirror of being"
THE term "bend sinister" means a heraldic bar or band drawn from the left side (and popularly, but incorrectly, supposed to denote bastardy.) This choice of a title was an attempt to suggest an outline broken by refracation, a distortion in the mirror of being a wrong turn taken by life.
Bend Sinister (novel), a 1947 novel by Vladimir Nabokov
Argent a bend sinister gules
By Ipankonin - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=3054816