Board Thread:General Discussion/@comment-26091970-20150604000724/@comment-26154973-20151001022915

Devs just used 装甲空母, which is a real thing (, , same way as there was this type). This also says 大型空母＝CVB and Shinano also refereed to as 大型空母 or 巨大空母 (but Taihou article also refer to her and Cranes as 大型空母, so it's a bit confusing), so there is a possibility for this, too.

In any case, CVB specifically for 装甲空母 is wrong, unless it's B for breastplates :)