一切經音義 30.7

30.7

垓佛土（上改哀反賈注國語云垓數也許叔重注淮南子云九垓九天也考聲云限極也八垓八極也風俗通云十千曰万十万曰億十億曰兆十兆曰京十京曰垓言數之極多者也說文從土亥聲者也）。

垓佛土 (The upper character is fanqie g[ai] + [ai]. Jia's commentary on the Guoyu says: '垓 is a number.' Xu Shuzhong's [Xu Shen's] commentary on the Huainanzi says: 'The nine gais are the nine heavens.' The Kaosheng says: 'A boundary or extremity; the eight gais are the eight extremities.' The Fengsu tong says: 'Ten thousands are a wan; ten wans are a yi; ten yis are a zhao; ten zhaos are a jing; ten jings are a gai; this refers to an extremely large number.' The Shuowen says: 'It derives from 土 with 亥 as phonetic.')