[[Hijiri Byakuren]]'s magical accessory. It's a colorful scroll with sutras written on it, said to be able to chant them on its own. Only Byakuren is able to handle it.
The [[Symposium of Post-Mysticism]] said its official name is 魔人経巻 ([i]Majin Kyoukan[/i]), but its common Japanese name is the Air Scroll (エア巻物) which came from "one of her spell card.":http://en.touhouwiki.net/wiki/Undefined_Fantastic_Object/Spell_Cards/Stage_6#Spell_Card_94 

h4.See also:

* "Touhou Wiki":http://en.touhouwiki.net/wiki/Byakuren_Hijiri#Sorcerer.27s_Sutra_Scroll 
エア巻物