in the anime Soul Eater it is used for students to contact Shinigami-sama via 42-42-564 it means Death-Death-Murder in Japanese Numerics
Byakuya Kuchiki and Renji Abarai from Soul Society come to take Rukia back because the transference of Shinigami powers to a human is a capital offense.
Mayuri Kurotsuchi, a character who is Captain of the 12th Division and President of the Shinigami Research Institute in the Japanese Bleach series.