A Chinese character, also known as a Han character (汉字/漢字; Hànzì), is a logogram used in writing Chinese (hanzi), Japanese (kanji), less frequently Korean (hanja), and formerly Vietnamese, and other languages. Chinese characters are also known as sinographs, and the Chinese writing system as sinography. Chinese characters are the oldest continuously used system of writing in the world.
The number of Chinese characters contained in the Kangxi dictionary is approximately 47,035, although a large number of these are rarely used variants accumulated throughout history. Studies carried out in China have shown that full literacy in the Chinese language requires a knowledge of between three and four thousand characters.