place name in Taiwan, Taipei
舺 is a rare kanji used primarily as a place name in Taiwan, specifically referring to Taipei. Its standalone meaning is tied to that geographic reference rather than a broad conceptual center.
舺 is a modern character composed of 舟 (boat) and 甲 (shell, armor). It was likely created as a phono-semantic compound for the Taiwanese place name, but its exact historical development is uncertain.
A boat 舟 with a shell-like covering 甲: picture a distinctive boat used in the Taipei area, like a covered ferry, giving the place its name.
For コウ, imagine a boat named the "Kou" sailing into Taipei harbor: Kou -> コウ, and the boat's name becomes the place name.