This takes me back to 20 years ago when I was studying Japanese. Their traditional (pre-Arabic-numerals) system uses four-digit groupings instead of three: There are characters for ten, hundred, thousand, and ten-thousand. (I assume Chinese is similar.)

Sometimes we use the number "1 million" to mean "a lot"; in that system it would be written as 100 ten-thousands. A more "natural" way to express "a lot" in that system is ten-thousand ten-thousands, or 100 million in our system.

I loved learning little "weird" things like that, and discovering that our own way of doing things isn't the only way. Studying other cultures also teaches us about our own.

Any better-qualified Japanese speakers please correct anything I've gotten wrong, this memory file was just swapped in from 20 years ago...