Zhang San, China's most familiar name. Zhang San may be a real person, but more often he refers to an unspecified person together with Li Si and Wang Wu, teasing or generalizing. For example, ancient storytellers often say: three lives and four lives are here. It is also often used in literature and film and television works. So the name is very common, and it has recently been used to refer to an ordinary group, that is, "Zhang Sanzu".