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京 (數字單位)

唐五代时期的敦煌算经残卷(P.3349),其中以万万兆为一京(“凡数不过十名不过万,故至万万即改”),即1024

,或作[1],是漢字文化圈內使用的一個數字單位,其意義因古今、地域而異。「京」字在數字中是大數1016(即“一亿亿”)的名稱之一,古代有用來表示107、1024、1032等的情況。一京公里當於1057光年、324.3秒差距。現在,台灣日本韓國統一用於表示1016,但鮮有使用。全国科学技术名词审定委员会曾提出过大数定名建议,将1016、1020分别定名为“京”、“万京”[2],但無相關規範,亦已基本不用,「京」這樣的大數常以科学记数法表示。

京的單位與上下數可參考下表。

數量級 十進・下數 萬進(現在) 億進・中數 平方・上數
107 千萬
108 一億
1016 恒河沙 一兆
1024 - 一秭 一亿兆
1032 - 一沟 一垓

參見

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參考資料

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  1. ^ 見《太平御覽‧工藝部七》。
  2. ^ 专家热议如何为“万万亿”次计算机定名. 光明日报. 2013-03-18. 15版:科技天地 [2023-10-22]. 
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京 (數字單位)
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