What are the ゴロ番, and how do they work?


> **Possible Duplicate:**  
>  [Rules for slang of Japanese
> numbers](https://japanese.stackexchange.com/questions/853/rules-for-slang-
> of-japanese-numbers)

They seem to be some form of replacing kana sounds with numbers to spell
things with numbers. Are these actually used anywhere "real"? or are they just
a bit of fansite silliness?

