一切經音義 6.101

6.101

十二京（景迎反說文從口作京今俗從曰作亰非也十二京者數法名也謹案劉洪九京筭經從一至載數法之名有十五等京當第八千萬億兆京）。

Twelve quadrillions (十二京: the second is pronounced with the fanqie 景迎 [jīng]. The Shuowen writes it with 'mouth' [口] as 京; today it is vulgarly written with 'speak' [曰] as 亰, which is incorrect. 'Twelve jing' is a designation in numeration. I note that Liu Hong's Computational Classic of Nine Jing states that in the names of numeration from one up to zai (10⁴⁴) there are fifteen orders of magnitude; jing corresponds to the eighth: thousands, tens of thousands (wan), hundreds of millions (yi), trillions (zhao), quadrillions (jing)).