ClassQuestion now has support for asking questions in all modern languages and writing systems! All letters and symbols for every modern language (Chinese, Greek, Korean, German, etc.) are covered.
The full list of every supported character is too large to fully list, but to get an idea you can check out the UTF8 standard which the site now supports: https://en.wikipedia.org/wiki/List_of_Unicode_characters. UTF8 not only supports various languages, but also includes mathematical symbols ∑ and emoji 😀 as well!