Which character is the same as English?

Answer=〇 meaning zero. The Roman numerals 1-9 are also used by Chinese in dates etc. and all Chinese people know them as well as the Chinese numerals. They also know most letters of the alphabet but especially older people may not be very good at pinyin. (By the way there is another character for zero 零 but don't worry too much about that one for the time being)

回 huí return

What could be easier than this character? A square within a square and what does it mean? Return, (go, come) back