六头首 (六頭首) liù tóu shǒu

liù tóu shǒu phrase group of six head monastics in a monastery
Domain: Buddhism 佛教 , Subdomain: Chan
Notes: The enumeration of the six varies by school with Linji and Caodong each having their own list (Ding '六頭首'; FGDB '六頭首')