AlBook internal codename?

So I recently traded in my old and busted TiBook at work for a shiny new 1.33GHz AlBook 15", but am curious as to what Apple's codename for this beast was. All I've been able to turn up is "Q16," which is neither cute nor really a codename. The 17's go by Hammerhead, and the 12's are Thrasher, but what about the 15's?