As it happened, I blogged B-gata H-kei before I watched the OP, which introduced the official shorthand "BH". So, I asked folks at #animeblogger what to call the category slug and someone suggested "Gatakei". Sadly, I do not remember who it was, especially since I liked the suggestion, adopted it, and used it ever since. Some other people tried to mock me for it, but hey, whatever. And today I found someone else who thought the same: Aorii of Major Arcana. So there. We will multiply and we will prevail.