The reason why it uses the carp shape is that Hiroshima has long been called the city of water and that it was also called "the city of carp" because carp lived there. Therefore, we have tried overlapping it with the image of Nishikigoi (a brocade carp) wearing the Mitsubishi colors "red, black, and white" to express both Hiroshima and Mitsubishi.
The ripples of water represent the expansion from Hiroshima to the world.