The title was originally Ruby + Agile, but recently in Japan, ‘x’ is [a] more cool saying, and it means ‘versus’ sometimes used for discussion and of course [it] makes more than [the] sum.
Miffy, known as Nijntje in Dutch, has an "x" for a mouth and has inspired several animated television series in Japan.
米菲(荷兰语为Nijntje)有一张“ x ”字形的嘴，日本有众多与之相关的动画系列。
3
In 1987, friends of Shechtman in France and Japan succeeded in growing crystals large enough for x-rays to repeat and verify what he had discovered with the electron microscope.