batsubyou

An unofficial name of a white cat with a red circle on its belly in Kantai Collection.

It appeared in the game's "server error" page with an Error Musume. Its name is a wordplay for "batsubyou" (抜錨, literally "to weigh anchor") and "byou" (another reading of 猫 / neko, a cat).

Now the developers of Kantai Collection officially call all bugs and errors in the game "cats".