because the author is using a nonstandard pronunciation for a character or a term—for example, comic books often employ ruby to emphasize dajare puns, as in Hana Yori Dango (rather than standard "Danshi" reading), and show both of the pronunciation and meaning, as in "One Piece" in One Piece (displayed by ruby character "Wan Piisu" ("One Piece") as the pronunciation and main character "Hitotsunagi no Daihihou" ("The Great Treasure of One Piece") as meaning).