一切經音義 9.14

9.14

那術（經又作述同食聿反或言那由他正言那庾多當中國十萬光讚經云億那術劫是也案佛本行經一百千是名俱致此當千萬百俱致名阿由多此當千億百阿由多名那由他此當萬億此應上筭也）。

Nashu (那術). In the scripture it is also written with 述; both are pronounced with the fanqie 食聿 [sh/yu]. It is also called nayouta (nayuta); correctly spoken it is nayuduo (nayuta), which corresponds to one hundred thousand in the Central Land (China). The Guangzan jing says 'hundreds of millions of nayuta kalpas', which is this. According to the Buddhacarita-sūtra, one hundred thousand is called a koṭi, which corresponds to ten million; one hundred koṭis is called an ayuta, which corresponds to one billion; one hundred ayutas is called a nayuta, which corresponds to one hundred billion; this must be the higher system of calculation.