If you’ve studied Chinese characters, you know that each number has its own Chinese character. As a joke, many Chinese-illiterate foreigners boast that they know three Chinese characters: 一 二 三 (1, 2, 3). After 3, though, the characters start getting a little harder to remember. Or do they? Recently I discovered this little-known character: 亖. It means 4. I didn’t find a similar one for 5, though.

Still, there’s a lot more to Chinese number characters below the surface. One set of “standard variants” are the 大写 (”capital”) characters used on checks and other transactions. Banks require their use on forms. Each digit 0-9, as well as 10, 100, and 1000 has a “capital” form, much more difficult to alter than a 一.

In the following chart, the first column is European numerals (that’s right, I didn’t say Arabic numerals, and I did it on purpose), the second column is the standard Chinese character, and the third column is the “capital” Chinese character.

Still, there are a lot more variants than the official “capital” forms. Check out the following ones.

1 一 弌 （all pronounced yī)
2 二 弍 弐 （all pronounced èr)
3 三 弎 （all pronounced sān)
4 四 亖 （all pronounced sì)
20 二十 廿
30 三十 卅
40 四十 卌