= U =
Anywhere outside the kernel. "That code
belongs in userland." This term has been in common use among
Linux kernel hackers since at least 1997, and may have have
originated in that community (a sighting has been reported from the
1995 archives of a NetBSD mailing list, however).
--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.