One of the most important parts of the Chinese belief of the 12 zodiac animals is the concept of "benming year". As there are twelve animals used to number years, the year represented by the same animal as that in a person's birth year returns every 12 years, which is traditionally called "Benming Year" (literally meaning "a year of personal destiny"). Many ethnic groups of China pay special attention to a person's 60th birthday, which is called "huajia" (meaning a sexagenary cycle). It is the 6th benming year of a person's life and indicates the completion of a full cycle in the Chinese cyclic numeral system.