Masato @ Takashina has thrown naming conventions to the winds and decided to also call his Comiket 79 release 47PF, as he did his previous Comiket 78 release. Perhaps it's to show that 47PF (Winter 2010) is more or less a continuation of the previous idea, with a random assortment of fashionable girl illustrations from the past year just grouped together.
I've always thought that Masato@Takashina should be more well-known than he is, considering how long he's been around with his cute girls and colorful scenic style. My theory is the name is holding him back, because seriously, why would anyone need a @ in their name? I'm looking at you too, Ma@ya.