legendary Daoist monk and martial artist said to have founded the Wudang Sect and Taijiquan during the late Song, Yuan, or Ming dynasties

anybody; anyone at all; refers to people in general rather than specific individuals. Literal meaning is 'Zhang number three and Li number four'.

(variant form) any person; someone of no particular importance; people in general

Used as generic names to refer to any person or any group of ordinary people.