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In Japanese they use 分, 厘, 毛, 糸, 忽, 微, 繊, 沙, 塵, 埃 for negative powers of 10 from 10-1 to 10-10 respectively

Old system

There's also another system with a little bit different value range

New system

https://en.wikipedia.org/wiki/Japanese_numerals#Powers_of_10

Do any other languages have words similar to this?

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    English has a limited sense of this, with "percent (%)" for 10^-2 and the exceeding rare "permille (‰)" and "permyriad (‱)" for 10^-3 and 10^-4 respectively. Aug 19, 2017 at 13:37
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    @MarkBeadles the difference in Japanese is that they can be used to say decimal numbers like 0.2589 Aug 19, 2017 at 13:49
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    I guess English can do this, somewhat awkwardly (0.2589 = 2589 ten-thousandths). I’m excited to learn this about Japanese, thanks. Aug 19, 2017 at 13:57
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    Tenth, hundredth, thousandth?
    – Draconis
    Aug 19, 2017 at 16:49
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    If you merely said 一分 ichi-bu, people would not automatically assume 1/100th in general contexts, they would assume 1 part. Similarly obscure words probably exist in many languages.
    – virmaior
    Aug 20, 2017 at 12:34

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