一切經音義 16.224

16.224

億姟（古文作畡奒二形今作姟同古才反數名風俗通曰十億曰兆十兆曰京十京曰姟猶大數也）。

Hundred-millions and tens of quadrillions (億姟) (the ancient characters have the two forms 畡 and 奒; currently written as 姟, identically fanqie: 古 + 才; the name of a numeral. The Fengsu tong says: "Ten hundred-millions (yì) are a trillion (zhào); ten trillions are a ten-trillion (jīng); ten ten-trillions are a ten-quadrillion (gāi)"; here it refers to an exceedingly large number).