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I often hear Japanese using a different method for saying a number like "248"
as によんぱ — especially for highways and license plates.

While this one is easy to understand, there are others that I don't quite
understand. Could someone provide a list of the different pronunciations of
each number?

"2525" being ニコニコ is probably a good example of what I'm talking about.

> 1:い  
>  2:に  
>  3:  
>  4:よん  
>  5:こ  
>  6:  
>  7:  
>  8:は、ぱ  
>  9:
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2011-06-09T03:34:58.777
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slang numbers puns
Rules for slang of Japanese numbers
There is no rule per se and an exhaustive list will need to be in a form of
community wiki to be editable by everyone.

A mix of "on-" and "kun-" readings (without the last consonant) + some English
pronunciation + some kana modification will work.

I'll list what I've heard with some example if possible: (I'm sure there are
some commercial playing on these to advertise their phone numbers as well as a
lot of other puns with numbers)

> 0: オ (0840 = おはよう), レイ, マル  
>  1: ィ (0141 = おいしい)  
>  2: ツ, 二  
>  3: サン （～さん）, サ, ミ  
>  4: シ, ヨ (4649 = よろしく)  
>  5: ゴ, ィ  
>  6: ロ (168 = いろは), ム (361 = さむい)  
>  7: ナ (723 = なつみ)  
>  8: パ (883 = パパさん), ハ  
>  9: ク (931 = くさい)  
>  10: ト, トウ, テン
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2011-06-09T04:13:03.733
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As with @repecmps's answer, there's no real set rule, but often businesses
will make up catchy words so that you can easily remember them. For example,
the phone number 0840-0141 could be おはよう、おいしい to remind you of a breakfast
diner. Also, people with the last name Saito (さいとう) often attach 3110 (3-さ,
1-い, 10-とう) to their email address, screen names, etc. You just have to be
clever.
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2011-06-09T04:24:01.277
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That's called 語呂合わせ and you could find full article at
[Wikipedia](http://ja.wikipedia.org/wiki/%E8%AA%9E%E5%91%82%E5%90%88%E3%82%8F%E3%81%9B).

Quoted from
[Wikepedia](http://ja.wikipedia.org/wiki/%E8%AA%9E%E5%91%82%E5%90%88%E3%82%8F%E3%81%9B#.E6.95.B0.E5.AD.97.E3.81.AE.E6.9A.97.E8.A8.98)

> 1 : いち、い、ひとつ、ひと
>
> 2 : に、ふたつ、ふた、ふ、つ（英語から）、じ
>
> 3 : さん、さ、みっつ、みつ、み
>
> 4 : よん、よ、よっつ、し、ふぉ（英語から）、ほ
>
> 5 : ご、こ、い、いつつ、いつ
>
> 6 : ろく、ろ、むっつ、むつ、む
>
> 7 : しち、ななつ、なな、な
>
> 8 : はち、は、ぱあ、やっつ、やつ、や、やあ
>
> 9 : きゅう、きゅ、く、ここのつ、ここの、こ
>
> 0 : れい、れ、ぜろ、ない、わ（字形から）、まる（字形から）、おー（アルファベットのOから。）
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2011-06-09T04:59:52.430
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