日 (rì) is an extremely common and useful word. Most of the time, it is used to mean "day," "date," or "day of the month." For example, when asking the date, you would ask ”今天几月几日？“ (jīntiān jǐyuè jǐrì?), literally "this day is which month, which day?" 星期日 (xīngqīrì) is the Chinese word for "Sunday." 日 can also be used to refer to the sun, as it does in Japan's name:日本 (rì běn), which means "the sun's origin.