一切經音義 11.214

11.214

兆垓（數法名也黃帝九章筭法數有一十五等所謂一十百千萬億兆京垓秭壤溝澗正載此則第七及第九數名也）。

Trillions and quadrillions (zhaogai: names of numerical places. In the Yellow Emperor's Nine Chapters on Mathematical Arts, numbers have fifteen orders: namely, ones, tens, hundreds, thousands, ten thousands, hundred thousands, millions, ten millions, billions, trillions, quadrillions, quintillions, sextillions, septillions, and octillions. These are the seventh and ninth numeral names.)