In C, a data structure is called a (variant) struct; and if Perlers called a data structure a struct then I would urge a top-level namespace of Struct::. But since that's not the case, I don't have a ready solution. Perhaps we should start calling them structs. This would be easier than trying to mumble around HoHoA... erm, HoAoH... erm, object-like-thing.
We have the more flexible data structures; they have the shorter name that requires less disambiguation.