setfacl(1) is a command-line utility to set ACL (Access Control List) information on files, part of a withdrawn POSIX draft from 1997
setfacl(1), short from Set File ACL, is a command-line utility in some modern UNIX systems that lets the user set access control information on the specified files.
It was part of an abandoned and withdrawn IEEE Standards Draft from 1997, originally meant to be part of posix.