batsubyou

抜猫 (ばつびょう)

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